From 423d970d7b4fc4627d5e337f4e002fbd3300a5d0 Mon Sep 17 00:00:00 2001
From: Karl Berry <karl@freefriends.org>
Date: Wed, 16 Feb 2022 21:17:13 +0000
Subject: nicematrix (16feb22)

git-svn-id: svn://tug.org/texlive/trunk@62043 c570f23f-e606-0410-a88d-b1316a301751
---
 .../doc/latex/nicematrix/nicematrix-french.pdf     | Bin 499106 -> 502752 bytes
 .../doc/latex/nicematrix/nicematrix-french.tex     | 103 +++-
 .../texmf-dist/doc/latex/nicematrix/nicematrix.pdf | Bin 1482850 -> 1489647 bytes
 .../source/latex/nicematrix/nicematrix.dtx         | 534 +++++++++++++--------
 .../texmf-dist/tex/latex/nicematrix/nicematrix.sty | 323 +++++++------
 5 files changed, 618 insertions(+), 342 deletions(-)

(limited to 'Master')

diff --git a/Master/texmf-dist/doc/latex/nicematrix/nicematrix-french.pdf b/Master/texmf-dist/doc/latex/nicematrix/nicematrix-french.pdf
index 0e75045e9a0..060eb817730 100644
Binary files a/Master/texmf-dist/doc/latex/nicematrix/nicematrix-french.pdf and b/Master/texmf-dist/doc/latex/nicematrix/nicematrix-french.pdf differ
diff --git a/Master/texmf-dist/doc/latex/nicematrix/nicematrix-french.tex b/Master/texmf-dist/doc/latex/nicematrix/nicematrix-french.tex
index fc2cc12e341..d97d20c70ef 100644
--- a/Master/texmf-dist/doc/latex/nicematrix/nicematrix-french.tex
+++ b/Master/texmf-dist/doc/latex/nicematrix/nicematrix-french.tex
@@ -10,7 +10,7 @@
 \usepackage{nicematrix}
 
 \usepackage{tikz}
-\usetikzlibrary{fit,patterns,arrows.meta}
+\usetikzlibrary{fit,patterns,arrows.meta,decorations.pathmorphing}
 
 \usepackage{enumitem}
 \usepackage{siunitx}
@@ -1246,7 +1246,8 @@ tracées par |\hdottedline| et «|:|» ont ce même effet.
 commandes et des lettres pour des filets personnalisés avec la clé
 |custom-line|, utilisable dans |\NiceMatrixOptions| ou bien dans un
 environnement. Cette clé prend en argument une liste de paires de la forme
-\textsl{clé=valeur}. Les clés disponibles sont les suivantes :
+\textsl{clé=valeur}. Il y a d'abord deux clés pour spécifier les outils qui
+permettront d'utiliser ce nouveau type de filet.
 
 \begin{itemize}
 \item la clé |command| indique le nom (sans la contre-oblique) d'une commande
@@ -1256,8 +1257,20 @@ tracer des filets horizontaux (de manière similaire à |\hline|) ;
 \item la clé |letter| prend en argument une lettre\footnote{Les lettres
   suivantes ne sont pas autorisées : \verb+lcrpmbVX:|()[]!@<>+} qui pourra être utilisée par
 l'utilisateur dans le préambule d'un environnement à préambule (comme
-|{NiceTabular}|) pour spécifier un filet vertical ;
+|{NiceTabular}|) pour spécifier un filet vertical.
+\end{itemize}
+
+\bigskip
+Pour la description du filet elle-même, il y a trois possibilités. 
+
 
+\begin{itemize}
+\item \emph{Première possibilité}\par\nobreak
+
+Il est possible de spécifier des filets multiples, colorés avec une couleur
+entre les filets (comme on peut le faire avec \pkg{colortbl} par exemple).
+
+\begin{itemize}
 \item la clé |multiplicity| indique le nombre de traits successifs qui seront
 tracés : par exemple, une valeur de~$2$ va créer des filets doubles comme créés
 en standard par |\hline\hline| ou bien \verb+||+ dans le préambule d'un
@@ -1266,13 +1279,35 @@ environnement ;
 \item la clé |color| fixe la couleur des filets ;
 
 \item la clé |sep-color| fixe la couleur entre deux filets consécutifs (n'a
-d'intérêt que dans le cas où la clé |multiplicity| est utilisée) ;
+d'intérêt que dans le cas où la clé |multiplicity| est utilisée).
+\end{itemize}
 
-\item la clé |dotted| impose un style de pointillés qui utilise le système
-de pointillés de la commande |\hdottedline| (et de la lettre \verb|:|) décrit à
-la partie précédente (cf. p.~\pageref{dotted}). 
+\bigskip
+\item \emph{Deuxième possibilité}\par\nobreak
+
+On peut utiliser la clé |dotted| qui impose un style de pointillés qui utilise
+le système de pointillés de la commande |\hdottedline| (et de la lettre
+\verb|:|) décrit à la partie précédente (cf. p.~\pageref{dotted}). La clé
+|color| est en fait aussi utilisable dans ce cas-là.
+
+\bigskip
+\item \colorbox{yellow!50}{\textbf{Nouveau 6.6}}\enskip \emph{Troisième
+  possibilité}
+
+On peut utiliser la clé |tikz| (si Tikz est chargé, \pkg{nicematrix} ne
+chargeant par défaut que \textsc{pgf}). Dans ce cas-là, le filet est tracé
+directement avec Tikz en utilisant comme paramètres la valeur de la clé |tikz|
+qui doit être une liste de couples \textsl{clé=valeur} applicables à un chemin
+Tikz.
+
+Par défaut aucune réservation de place n'est faite par défaut pour le filet qui
+sera tracé avec Tikz. On peut demander une réservation (horizontale pour un
+filet vertical et verticale pour un filet horizontal) avec la clé |width| qui
+est donc en quelque sorte la largeur du filet qui sera tracé (cette largeur
+n'est pas déduite des caractéristiques fournies par la clé |tikz|).
 \end{itemize}
 
+
 \medskip
 Ce système permet en particulier de définir des commandes pour tracer des filets
 avec une couleur spécifique (et ces filets respecteront les blocs comme les
@@ -1307,6 +1342,52 @@ Produit C & 5 & 4 & 1 \\
 \end{center}
 
 
+\bigskip
+Voici un exemple avec la clé |tikz|.
+
+\begin{Verbatim}
+\documentclass{article}
+\usepackage{nicematrix,tikz}
+\usetikzlibrary{decorations.pathmorphing}
+
+\NiceMatrixOptions
+  {
+    custom-line = 
+     {
+       letter = I , 
+       ~emphase#tikz = { decorate, decoration = { coil, aspect = 0 } }}@ ,
+       ~emphase#width = 2 mm@ 
+     }
+  }
+
+\begin{document}
+\begin{NiceTabular}{cIcIc}
+un & deux & trois \\
+quatre & cinq & six \\
+sept & huit & neuf
+\end{NiceTabular}
+\end{document}
+\end{Verbatim}
+
+\begin{center}
+\NiceMatrixOptions
+  {
+    custom-line = 
+     {
+       letter = I , 
+       tikz = { decorate, decoration = { coil, aspect = 0 } } ,
+       width = 2 mm 
+     }
+  }
+\begin{NiceTabular}{cIcIc}
+un & deux & trois \\
+quatre & cinq & six \\
+sept & huit & neuf
+\end{NiceTabular}
+\end{center}
+
+
+
 \section{Les couleurs des rangées et des colonnes}
 
 \subsection{Utilisation de colortbl}
@@ -1812,7 +1893,9 @@ concerné.\footnote{Pour le moment, cette clé n'est \emph{pas} disponible dans
 
 On a alors accès aux trois commandes suivantes :
 \begin{itemize}
-\item |\cellcolor| qui colorie la case courante ;
+\item |\cellcolor| qui colorie la case courante\footnote{Néanmoins, cette
+  commande |\cellcolor| supprimera les espaces qui la suivent, ce que ne fait
+  pas la commande |\cellcolor| de \pkg{colortbl}.} ;
 \item |\rowcolor| à utiliser dans une case et qui colorie le reste de la rangée
 ;
 \item |\columncolor| à utiliser dans le préambule du tableau de la même manière
@@ -2130,6 +2213,10 @@ un très très très très long texte
 \end{center}
 
 
+Remarquons que l'extension \pkg{varwidth} a quelques problèmes (au moins dans sa
+version 0.92). Par exemple, avec LuaLaTeX, elle en fonctionne pas si le contenu
+commence par une instruction |\color|.
+
 \subsection{Les colonnes X}
 
 
diff --git a/Master/texmf-dist/doc/latex/nicematrix/nicematrix.pdf b/Master/texmf-dist/doc/latex/nicematrix/nicematrix.pdf
index 703b8f8c3b8..d96ed3fa4a6 100644
Binary files a/Master/texmf-dist/doc/latex/nicematrix/nicematrix.pdf and b/Master/texmf-dist/doc/latex/nicematrix/nicematrix.pdf differ
diff --git a/Master/texmf-dist/source/latex/nicematrix/nicematrix.dtx b/Master/texmf-dist/source/latex/nicematrix/nicematrix.dtx
index 80d98ae17e3..cf717533a16 100644
--- a/Master/texmf-dist/source/latex/nicematrix/nicematrix.dtx
+++ b/Master/texmf-dist/source/latex/nicematrix/nicematrix.dtx
@@ -15,8 +15,8 @@
 %
 % \fi
 % \iffalse
-\def\myfileversion{6.5}
-\def\myfiledate{2022/01/23}
+\def\myfileversion{6.6}
+\def\myfiledate{2022/02/16}
 %
 %
 %<*batchfile>
@@ -53,7 +53,7 @@ version 2005/12/01 or later.
 \geometry{left=2.8cm,right=2.8cm,top=2.5cm,bottom=2.5cm,papersize={21cm,29.7cm}}
 
 \usepackage{tikz}
-\usetikzlibrary{fit,patterns,arrows.meta}
+\usetikzlibrary{fit,patterns,arrows.meta,decorations.pathmorphing}
 \usepackage{nicematrix}
 \usepackage{siunitx}
 \usepackage{varwidth}
@@ -1257,8 +1257,9 @@ version 2005/12/01 or later.
 % \colorbox{yellow!50}{\textbf{New 6.5}}\enskip It's possible to define commands
 % and letters for customized rules with the key |custom-line| available in
 % |\NiceMatrixOptions| and in the options of individual environments. That key
-% takes in as argument a list of \textsl{key=value} pairs. The available keys
-% are the following:
+% takes in as argument a list of \textsl{key=value} pairs. First, there is two
+% keys to define the tools which will be used to use that new type of rule.
+% 
 % \begin{itemize}
 % \item the key |command| is the name (without the backslahs) of a command that
 % will be created by \pkg{nicematrix} and that will be available for the final
@@ -1267,8 +1268,19 @@ version 2005/12/01 or later.
 % \item the key |letter| takes in as argument a letter\footnote{The following
 % letters are forbidden: \verb+lcrpmbVX:|()[]!@<>+} that the user will use in
 % the preamble of an environment with preamble (such as |{NiceTabular}| in order
-% to specify a vertical rule;
+% to specify a vertical rule.
+% \end{itemize}
+% 
+% \bigskip
+% For the description of the rule itself, there is three possibilities.
 %
+% \begin{itemize}
+% \item \emph{First possibility}\par\nobreak
+% 
+% It's possible to specify composite rules, with a color and a color for the
+% inter-rule space (as possible with \pkg{colortbl} for instance).
+% 
+% \begin{itemize}
 % \item the key |multiplicity| is the number to consecutive rules that will be
 % drawn: for instance, a value of $2$ will create double rules such those
 % created by |\hline\hline| or \verb+||+ in the preamble of an environment;
@@ -1276,13 +1288,33 @@ version 2005/12/01 or later.
 % \item the key |color| sets the color of the rule ;
 %
 % \item the key |sep-color| sets the color between two successive rules (should be
-% used only in conjonction with |multiplicity|);
+% used only in conjonction with |multiplicity|).
+% \end{itemize}
+% 
+% \bigskip
+% \item \emph{Second possibility}\par\nobreak
+% 
+% The key |dotted| forces a style with dotted rules such as those created by
+% |\hdottedline| or the letter ``|:|'' in the preamble (cf.
+% p.~\pageref{dotted}). The key |color| may be used also in that case.
 %
-% \item the key |dotted| forces a style with dotted rules such as those created by
-% |\hdottedline| or the letter ``|:|'' in the preamble (cf. p.~\pageref{dotted}).
+% \bigskip
+% \item \colorbox{yellow!50}{\textbf{New 6.6}}\enskip \emph{Third
+% possibility}\par\nobreak 
+% 
+% It's possible to use the key |tikz| (if Tikz is loaded). In that case, the
+% rule is drawn directly with Tikz by using as parameters the value of the key
+% |tikz| which must be a list of \textsl{key=value} pairs which may be applied
+% to a Tikz path.
+% 
+% By default, no space is reserved for the rule that will be drawn with Tikz. It
+% possible to specify a reservation (horizontal for a vertical rule and vertical
+% for an horizontal one) with the key |width|. That value of that key, is, in
+% some ways, the width of the rule that will be drawn (\pkg{nicematrix} does not
+% compute that width from the characteristics of the rule specified in |tikz|).
 % \end{itemize}
 % 
-% \medskip 
+% \bigskip
 % That system may be used, in particular, for the definition of commands and
 % letters to draw rules with a specific color (and those rules will respect the
 % blocks as do all rules of \pkg{nicematrix}).
@@ -1316,7 +1348,50 @@ version 2005/12/01 or later.
 % \end{NiceTabular}
 % \end{center}
 %
-% 
+% \bigskip
+% Here is an example of the key |tikz|.
+%
+% \begin{Verbatim}
+% \documentclass{article}
+% \usepackage{nicematrix,tikz}
+% \usetikzlibrary{decorations.pathmorphing}
+%
+% \NiceMatrixOptions
+%   {
+%     custom-line = 
+%      {
+%        letter = I , 
+%        ~emphase#tikz = { decorate, decoration = { coil, aspect = 0 } }}@ ,
+%        ~emphase#width = 2 mm@ 
+%      }
+%   }
+%
+% \begin{document}
+% \begin{NiceTabular}{cIcIc}
+% one & two & three \\
+% four & five & six \\
+% seven & eight & nine
+% \end{NiceTabular}
+% \end{document}
+% \end{Verbatim}
+%
+% \begin{center}
+% \NiceMatrixOptions
+%   {
+%     custom-line = 
+%      {
+%        letter = I , 
+%        tikz = { decorate, decoration = { coil, aspect = 0 } } ,
+%        width = 2 mm 
+%      }
+%   }
+% \begin{NiceTabular}{cIcIc}
+% one & two & three \\
+% four & five & six \\
+% seven & eight & nine
+% \end{NiceTabular}
+% \end{center}
+%
 %
 %\section{The color of the rows and columns}
 %
@@ -1801,7 +1876,9 @@ version 2005/12/01 or later.
 % There are three commands available (they are inspired by \pkg{colortbl} but
 % are \emph{independent} of \pkg{colortbl}):
 % \begin{itemize}
-% \item |\cellcolor| which colorizes a cell;
+% \item |\cellcolor| which colorizes a cell;\footnote{However, this command
+% |\cellcolor| will delete the following spaces, which does not the command
+% |\cellcolor| of \pkg{colortbl}.}
 % \item |\rowcolor| which must be used in a cell and which colorizes the end of
 % the row;
 % \item |\columncolor| which must be used in the preamble of the environment
@@ -2112,6 +2189,10 @@ version 2005/12/01 or later.
 % \end{NiceTabular}
 % \end{center}
 %
+% \bigskip
+% One should remark that the extension \pkg{varwidth} (at least in its version
+% 0.92) has some problems: for instance, with LuaLaTeX, it does not work when
+% the content begins with |\color|.
 %
 %
 % \subsection{The columns X}
@@ -5649,7 +5730,8 @@ version 2005/12/01 or later.
 %    \begin{macrocode}
 \bool_new:N \c_@@_in_preamble_bool
 \bool_set_true:N \c_@@_in_preamble_bool
-\AtBeginDocument { \bool_set_false:N \c_@@_in_preamble_bool }
+\hook_gput_code:nnn { begindocument } { . } 
+  { \bool_set_false:N \c_@@_in_preamble_bool }
 %    \end{macrocode}
 %
 %    \begin{macrocode}
@@ -5659,7 +5741,7 @@ version 2005/12/01 or later.
 \bool_new:N \c_@@_tabularx_loaded_bool
 \bool_new:N \c_@@_tikz_loaded_bool
 \bool_new:N \c_@@_varwidth_loaded_bool
-\AtBeginDocument
+\hook_gput_code:nnn { begindocument } { . }
   {
     \@ifpackageloaded { varwidth }
       { \bool_set_true:N \c_@@_varwidth_loaded_bool }
@@ -5789,7 +5871,7 @@ version 2005/12/01 or later.
 % be modified. In order to avoid an error message in this case, we will redefine
 % |\pgfutil@check@rerun| in the |aux| file.
 %    \begin{macrocode}
-\AtBeginDocument 
+\hook_gput_code:nnn { begindocument } { . } 
   {     
     \@ifpackageloaded { booktabs } 
       { \iow_now:Nn \@mainaux \nicematrix@redefine@check@rerun } 
@@ -5816,7 +5898,7 @@ version 2005/12/01 or later.
 % redefinition of |\everycr|.
 %    \begin{macrocode}
 \bool_new:N \c_@@_colortbl_loaded_bool 
-\AtBeginDocument 
+\hook_gput_code:nnn { begindocument } { . } 
   { 
     \@ifpackageloaded { colortbl }
       { \bool_set_true:N \c_@@_colortbl_loaded_bool }
@@ -5989,7 +6071,7 @@ version 2005/12/01 or later.
 % loaded, we redefine the |S| columns of \pkg{siunitx}.
 %    \begin{macrocode}
 \bool_new:N \c_@@_siunitx_loaded_bool 
-\AtBeginDocument 
+\hook_gput_code:nnn { begindocument } { . } 
   { 
     \@ifpackageloaded { siunitx }
       { \bool_set_true:N \c_@@_siunitx_loaded_bool }
@@ -6003,7 +6085,7 @@ version 2005/12/01 or later.
 % The command |\@@_renew_NC@rewrite@S:| will be used in each environment of
 % \pkg{nicematrix} in order to ``rewrite'' the |S| column in each environment.
 %    \begin{macrocode}
-\AtBeginDocument
+\hook_gput_code:nnn { begindocument } { . }
   {
     \bool_if:nTF { ! \c_@@_siunitx_loaded_bool }
       { \cs_set_eq:NN \@@_renew_NC@rewrite@S: \prg_do_nothing: }
@@ -6399,11 +6481,10 @@ version 2005/12/01 or later.
 % 
 % \bigskip
 % The L3 programming layer provides scratch dimensions |\l_tmpa_dim| and
-% |\l_tmpb_dim|. We creates two more in the same spirit (if they don't exist
-% yet: that's why we use |\dim_zero_new:N|).
+% |\l_tmpb_dim|. We creates two more in the same spirit.
 %    \begin{macrocode}
-\dim_zero_new:N \l_tmpc_dim 
-\dim_zero_new:N \l_tmpd_dim
+\dim_zero_new:N \l_@@_tmpc_dim 
+\dim_zero_new:N \l_@@_tmpd_dim
 %    \end{macrocode}
 %
 % \bigskip
@@ -6831,7 +6912,7 @@ version 2005/12/01 or later.
 % beginning of the document (we want to allow the user to load \pkg{enumitem}
 % after \pkg{nicematrix}).
 %    \begin{macrocode}
-\AtBeginDocument
+\hook_gput_code:nnn { begindocument } { . }
   {
     \bool_if:nTF { ! \c_@@_enumitem_loaded_bool }
       { 
@@ -7051,10 +7132,11 @@ version 2005/12/01 or later.
 % initial value is 0.45~em but it will be changed if the option |small| is used.
 %    \begin{macrocode}
 \dim_new:N \l_@@_inter_dots_dim
-\AtBeginDocument { \dim_set:Nn \l_@@_inter_dots_dim { 0.45 em } }
+\hook_gput_code:nnn { begindocument } { . } 
+  { \dim_set:Nn \l_@@_inter_dots_dim { 0.45 em } }
 %    \end{macrocode}
-% The |\AtBeginDocument| is only a security in case \cls{revtex4-1} is used
-% (even though it is obsolete).
+% We use a hook only by security in case \cls{revtex4-1}
+% is used (even though it is obsolete).
 %
 % \bigskip
 % The following dimension is the minimal distance between a node (in fact an
@@ -7063,10 +7145,11 @@ version 2005/12/01 or later.
 % distance may vary a little).
 %    \begin{macrocode}
 \dim_new:N \l_@@_xdots_shorten_dim
-\AtBeginDocument { \dim_set:Nn \l_@@_xdots_shorten_dim { 0.3 em } }
+\hook_gput_code:nnn { begindocument } { . } 
+  { \dim_set:Nn \l_@@_xdots_shorten_dim { 0.3 em } }
 %    \end{macrocode}
-% The |\AtBeginDocument| is only a security in case \cls{revtex4-1} is used
-% (even though it is obsolete).
+% We use a hook only by security in case \cls{revtex4-1} is used (even though it
+% is obsolete).
 % 
 % \bigskip
 % The following dimension is the radius of the dots for the dotted lines (when
@@ -7074,10 +7157,11 @@ version 2005/12/01 or later.
 % value is 0.53~pt but it will be changed if the option |small| is used.
 %    \begin{macrocode}
 \dim_new:N \l_@@_radius_dim
-\AtBeginDocument { \dim_set:Nn \l_@@_radius_dim { 0.53 pt } }
+\hook_gput_code:nnn { begindocument } { . } 
+  { \dim_set:Nn \l_@@_radius_dim { 0.53 pt } }
 %    \end{macrocode}
-% The |\AtBeginDocument| is only a security in case \cls{revtex4-1} is used
-% (even if it is obsolete).
+% We use a hook only by security in case \cls{revtex4-1} is used (even though it
+% is obsolete).
 %
 %
 % \bigskip
@@ -7134,10 +7218,11 @@ version 2005/12/01 or later.
 % \bigskip
 %    \begin{macrocode}
 \dim_new:N \l_@@_notes_above_space_dim 
-\AtBeginDocument { \dim_set:Nn \l_@@_notes_above_space_dim { 1 mm } }
+\hook_gput_code:nnn { begindocument } { . } 
+  { \dim_set:Nn \l_@@_notes_above_space_dim { 1 mm } }
 %    \end{macrocode}
-% The |\AtBeginDocument| is only a security in case \cls{revtex4-1} is used
-% (even if it is obsolete).
+% We use a hook only by security in case \cls{revtex4-1} is used (even though it
+% is obsolete).
 % 
 % \bigskip
 % The flag |\l_@@_nullify_dots_bool| corresponds to the option |nullify-dots|.
@@ -7487,7 +7572,7 @@ version 2005/12/01 or later.
       { 
         \bool_if:NTF \c_@@_in_preamble_bool
           { 
-            \AtBeginDocument 
+            \hook_gput_code:nnn { begindocument } { . } 
               { 
                 \bool_if:NT \c_@@_enumitem_loaded_bool
                   { \setlist* [ tabularnotes ] { #1 } }
@@ -7503,7 +7588,7 @@ version 2005/12/01 or later.
       { 
         \bool_if:NTF \c_@@_in_preamble_bool
           { 
-            \AtBeginDocument 
+            \hook_gput_code:nnn { begindocument } { . } 
               { 
                 \bool_if:NT \c_@@_enumitem_loaded_bool
                   { \setlist* [ tabularnotes* ] { #1 } }
@@ -7603,17 +7688,6 @@ version 2005/12/01 or later.
     renew-matrix .code:n = \@@_renew_matrix: ,
     renew-matrix .value_forbidden:n = true ,
 %    \end{macrocode}
-% The key |transparent| is now considered as obsolete (because its name is ambiguous).
-%    \begin{macrocode}
-    transparent .code:n = 
-      {
-        \@@_renew_matrix:
-        \bool_set_true:N \l_@@_renew_dots_bool
-        \@@_error:n { Key~transparent }
-      } ,
-    transparent .value_forbidden:n = true,
-%    \end{macrocode}
-%                              
 %
 % \bigskip
 % The option |exterior-arraycolsep| will have effect only in |{NiceArray}| for
@@ -8489,13 +8563,9 @@ version 2005/12/01 or later.
 % We redefine |\multicolumn| and, since we want |\multicolumn| to be available
 % in the potential environments |{tabular}| nested in the environments of
 % \pkg{nicematrix}, we patch |{tabular}| to go back to the original definition.
-% The command |\AtBeginEnvironment| is the command of \pkg{l3hooks} and, if this
-% command is not available (versions of LaTeX prior to 2020-10-01),
-% \pkg{etoolbox} is loaded and the command |\AtBeginDocument| of \pkg{etoolbox}
-% is used.
 %    \begin{macrocode}
     \cs_set_eq:NN \multicolumn \@@_multicolumn:nnn
-    \AtBeginEnvironment { tabular } 
+    \hook_gput_code:nnn { env / tabular / begin } { . }
       { \cs_set_eq:NN \multicolumn \@@_old_multicolumn }
 %    \end{macrocode}
 % 
@@ -8972,15 +9042,15 @@ version 2005/12/01 or later.
         \@@_qpoint:n { #1 }
         \dim_set_eq:NN \l_tmpb_dim \pgf@y
         \@@_qpoint:n { col - \@@_succ:n { #4 } }
-        \dim_set_eq:NN \l_tmpc_dim \pgf@x
+        \dim_set_eq:NN \l_@@_tmpc_dim \pgf@x
         \@@_qpoint:n { \@@_succ:n { #3 } }
-        \dim_set_eq:NN \l_tmpd_dim \pgf@y
+        \dim_set_eq:NN \l_@@_tmpd_dim \pgf@y
         \@@_pgf_rect_node:nnnnn
           { \@@_env: - #5 }
           { \dim_use:N \l_tmpa_dim }
           { \dim_use:N \l_tmpb_dim }
-          { \dim_use:N \l_tmpc_dim }
-          { \dim_use:N \l_tmpd_dim }
+          { \dim_use:N \l_@@_tmpc_dim }
+          { \dim_use:N \l_@@_tmpd_dim }
       }
   }
 %    \end{macrocode}
@@ -12018,7 +12088,7 @@ version 2005/12/01 or later.
 % |\@@_draw_dotted_lines:| whether Tikz is loaded or not (in that case, only
 % \textsc{pgf} is loaded).
 %    \begin{macrocode}
-\AtBeginDocument
+\hook_gput_code:nnn { begindocument } { . }
   {
     \cs_new_protected:Npx \@@_draw_dotted_lines:
       {
@@ -12087,16 +12157,16 @@ version 2005/12/01 or later.
         \@@_qpoint:n { row - \int_min:nn { ##1 } { \c@iRow + 1 } } 
         \dim_set_eq:NN \l_tmpb_dim \pgf@y
         \@@_qpoint:n { col - \int_min:nn { ##1 + 1 } { \c@jCol + 1 } } 
-        \dim_set_eq:NN \l_tmpc_dim \pgf@x
+        \dim_set_eq:NN \l_@@_tmpc_dim \pgf@x
         \@@_qpoint:n { row - \int_min:nn { ##1 + 1 } { \c@iRow + 1 } } 
-        \dim_set_eq:NN \l_tmpd_dim \pgf@y
+        \dim_set_eq:NN \l_@@_tmpd_dim \pgf@y
         \pgftransformshift { \pgfpoint \l_tmpa_dim \l_tmpb_dim }
 %    \end{macrocode}
 % Now, |\l_tmpa_dim| and |\l_tmpb_dim| become the width and the height of the
 % node (of shape |@à_diag_node|) that we will construct.
 %    \begin{macrocode}
-        \dim_set:Nn \l_tmpa_dim { ( \l_tmpc_dim - \l_tmpa_dim ) / 2 } 
-        \dim_set:Nn \l_tmpb_dim { ( \l_tmpd_dim - \l_tmpb_dim ) / 2 } 
+        \dim_set:Nn \l_tmpa_dim { ( \l_@@_tmpc_dim - \l_tmpa_dim ) / 2 } 
+        \dim_set:Nn \l_tmpb_dim { ( \l_@@_tmpd_dim - \l_tmpb_dim ) / 2 } 
         \pgfnode { @@_diag_node } { center } { } { \@@_env: - ##1 } { }
         \str_if_empty:NF \l_@@_name_str
           { \pgfnodealias { \l_@@_name_str - ##1 } { \@@_env: - ##1 } }
@@ -13290,17 +13360,17 @@ version 2005/12/01 or later.
 % \pkg{nicematrix} rely upon |{NiceArray}|). 
 %
 % 
-% \medskip
+% \medskip 
 % The syntax of these commands uses the character |_| as embellishment and
 % thats' why we have to insert a character |_| in the \emph{arg spec} of these
 % commands. However, we don't know the future catcode of |_| in the main
 % document (maybe the user will use \pkg{underscore}, and, in that case, the
 % catcode is $13$ because \pkg{underscore} activates |_|). That's why these
-% commands will be defined in a |\AtBeginDocument| and the \emph{arg spec} will
-% be rescanned. 
+% commands will be defined in a |\hook_gput_code:nnn { begindocument } { . }|
+% and the \emph{arg spec} will be rescanned.
 %
 %    \begin{macrocode}
-\AtBeginDocument 
+\hook_gput_code:nnn { begindocument } { . } 
   {
     \tl_set:Nn \l_@@_argspec_tl { O { } E { _ ^ } { { } { } } }
     \tl_set_rescan:Nno  \l_@@_argspec_tl { } \l_@@_argspec_tl
@@ -13418,7 +13488,7 @@ version 2005/12/01 or later.
       } 
   }
 %    \end{macrocode}
-% End of the |\AtBeginDocument|.
+% End of the |\AddToHook|.
 %
 %
 % \bigskip
@@ -13487,7 +13557,7 @@ version 2005/12/01 or later.
 % |\NewDocumentCommand| is protected and that's why we have put the
 % |\multicolumn| before (in the definition of |\@@_Hdotsfor:|).
 %    \begin{macrocode}
-\AtBeginDocument
+\hook_gput_code:nnn { begindocument } { . }
   {
     \tl_set:Nn \l_@@_argspec_tl { O { } m O { } E { _ ^ } { { } { } } }
     \tl_set_rescan:Nno \l_@@_argspec_tl { } \l_@@_argspec_tl
@@ -13513,7 +13583,7 @@ version 2005/12/01 or later.
       } 
   }
 %    \end{macrocode}
-% Enf of |\AtBeginDocument|.
+% Enf of |\AddToHook|.
 % 
 % \medskip
 %    \begin{macrocode}
@@ -13594,7 +13664,7 @@ version 2005/12/01 or later.
 %
 % \bigskip 
 %    \begin{macrocode}
-\AtBeginDocument
+\hook_gput_code:nnn { begindocument } { . }
   {
     \tl_set:Nn \l_@@_argspec_tl { O { } m O { } E { _ ^ } { { } { } } }
     \tl_set_rescan:Nno  \l_@@_argspec_tl { } \l_@@_argspec_tl
@@ -13614,7 +13684,7 @@ version 2005/12/01 or later.
       } 
   }
 %    \end{macrocode}
-% Enf of |\AtBeginDocument|.
+% Enf of |\AddToHook|.
 %
 %    \begin{macrocode}
 \cs_new_protected:Npn \@@_Vdotsfor:nnnn #1 #2 #3 #4
@@ -13725,7 +13795,7 @@ version 2005/12/01 or later.
 % construction uses the fact the |\@@_line_i:nn| is protected and that
 % |\@@_double_int_eval:n| is fully expandable).
 %    \begin{macrocode}
-\AtBeginDocument
+\hook_gput_code:nnn { begindocument } { . }
   {
     \tl_set:Nn \l_@@_argspec_tl { O { } m m ! O { } E { _ ^ } { { } { } } } 
     \tl_set_rescan:Nno  \l_@@_argspec_tl { } \l_@@_argspec_tl
@@ -13764,7 +13834,7 @@ version 2005/12/01 or later.
 %    \end{macrocode}
 %
 %    \begin{macrocode}
-\AtBeginDocument
+\hook_gput_code:nnn { begindocument } { . }
   {
     \cs_new_protected:Npx \@@_draw_line_ii:nn #1 #2
       {
@@ -13831,7 +13901,7 @@ version 2005/12/01 or later.
     nb-rows .int_set:N = \l_@@_key_nb_rows_int ,
     nb-rows .value_required:n = true ,
     nb-rows .initial:n = 1 ,
-    rowcolor .tl_set:N = \l_tmpc_tl ,
+    rowcolor .tl_set:N = \l_@@_tmpc_tl ,
     rowcolor .value_required:n = true ,
     rowcolor .initial:n = ,
     unknown .code:n = \@@_error:n { Unknown~key~for~RowStyle } 
@@ -13846,7 +13916,7 @@ version 2005/12/01 or later.
 %    \end{macrocode}
 % If the key |rowcolor| has been used.
 %    \begin{macrocode}
-    \tl_if_empty:NF \l_tmpc_tl
+    \tl_if_empty:NF \l_@@_tmpc_tl
       {
 %    \end{macrocode}
 % First, the end of the current row (we remind that |\RowStyle| applies to the
@@ -13855,7 +13925,7 @@ version 2005/12/01 or later.
         \tl_gput_right:Nx \g_nicematrix_code_before_tl 
           { 
             \@@_rectanglecolor 
-              { \l_tmpc_tl } 
+              { \l_@@_tmpc_tl } 
               { \int_use:N \c@iRow - \int_use:N \c@jCol }
               { \int_use:N \c@iRow - * }
           }
@@ -13867,7 +13937,7 @@ version 2005/12/01 or later.
             \tl_gput_right:Nx \g_nicematrix_code_before_tl 
               { 
                 \@@_rowcolor 
-                  { \l_tmpc_tl } 
+                  { \l_@@_tmpc_tl } 
                   { 
                     \int_eval:n { \c@iRow + 1 }
                     - \int_eval:n { \c@iRow + \l_@@_key_nb_rows_int - 1 } 
@@ -14092,13 +14162,13 @@ version 2005/12/01 or later.
 \cs_new_protected:Npn \@@_rectanglecolor:nnn #1 #2 #3
   {
     \@@_cut_on_hyphen:w #1 \q_stop
-    \tl_clear_new:N \l_tmpc_tl
-    \tl_clear_new:N \l_tmpd_tl
-    \tl_set_eq:NN \l_tmpc_tl \l_tmpa_tl
-    \tl_set_eq:NN \l_tmpd_tl \l_tmpb_tl
+    \tl_clear_new:N \l_@@_tmpc_tl
+    \tl_clear_new:N \l_@@_tmpd_tl
+    \tl_set_eq:NN \l_@@_tmpc_tl \l_tmpa_tl
+    \tl_set_eq:NN \l_@@_tmpd_tl \l_tmpb_tl
     \@@_cut_on_hyphen:w #2 \q_stop
-    \tl_set:Nx \l_@@_rows_tl { \l_tmpc_tl - \l_tmpa_tl }
-    \tl_set:Nx \l_@@_cols_tl { \l_tmpd_tl - \l_tmpb_tl }
+    \tl_set:Nx \l_@@_rows_tl { \l_@@_tmpc_tl - \l_tmpa_tl }
+    \tl_set:Nx \l_@@_cols_tl { \l_@@_tmpd_tl - \l_tmpb_tl }
 %    \end{macrocode}
 % The command |\@@_cartesian_path:n| takes in two implicit arguments:
 % |\l_@@_cols_tl| and |\l_@@_rows_tl|.
@@ -14221,9 +14291,9 @@ version 2005/12/01 or later.
         \bool_if:NTF \l_@@_rowcolors_restart_bool
           { \int_set:Nn \l_@@_color_int 1 }
           { \int_set:Nn \l_@@_color_int \l_tmpa_tl } 
-        \int_zero_new:N \l_tmpc_int
-        \int_set:Nn \l_tmpc_int \l_tmpb_tl
-        \int_do_until:nNnn \l_tmpa_int > \l_tmpc_int
+        \int_zero_new:N \l_@@_tmpc_int
+        \int_set:Nn \l_@@_tmpc_int \l_tmpb_tl
+        \int_do_until:nNnn \l_tmpa_int > \l_@@_tmpc_int
           {
 %    \end{macrocode}
 % We will compute in |\l_tmpb_int| the last row of the ``block''.
@@ -14245,7 +14315,7 @@ version 2005/12/01 or later.
             \tl_set:Nx \l_@@_rows_tl 
               { \int_use:N \l_tmpa_int - \int_use:N \l_tmpb_int } 
 %    \end{macrocode}
-% |\l_tmpc_tl| will be the color that we will use.
+% |\l_@@_tmpc_tl| will be the color that we will use.
 %    \begin{macrocode}
             \tl_clear_new:N \l_@@_color_tl
             \tl_set:Nx \l_@@_color_tl
@@ -14373,9 +14443,9 @@ version 2005/12/01 or later.
         \int_compare:nNnT \l_tmpb_tl > \c@jCol
           { \tl_set:Nx \l_tmpb_tl { \int_use:N \c@jCol } }
 %    \end{macrocode}
-% |\l_tmpc_tl| will contain the number of column.
+% |\l_@@_tmpc_tl| will contain the number of column.
 %    \begin{macrocode}
-        \tl_set_eq:NN \l_tmpc_tl \l_tmpa_tl
+        \tl_set_eq:NN \l_@@_tmpc_tl \l_tmpa_tl
 %    \end{macrocode}
 % If we decide to provide the commands |\cellcolor|, |\rectanglecolor|,
 % |\rowcolor|, |\columncolor|, |\rowcolors| and |\chessboardcolors| in the
@@ -14384,8 +14454,8 @@ version 2005/12/01 or later.
 %    \begin{macrocode}
         \@@_qpoint:n { col - \l_tmpa_tl }
         \int_compare:nNnTF \l_@@_first_col_int = \l_tmpa_tl
-          { \dim_set:Nn \l_tmpc_dim { \pgf@x - 0.5 \arrayrulewidth } }
-          { \dim_set:Nn \l_tmpc_dim { \pgf@x + 0.5 \arrayrulewidth } }
+          { \dim_set:Nn \l_@@_tmpc_dim { \pgf@x - 0.5 \arrayrulewidth } }
+          { \dim_set:Nn \l_@@_tmpc_dim { \pgf@x + 0.5 \arrayrulewidth } }
         \@@_qpoint:n { col - \@@_succ:n \l_tmpb_tl }
         \dim_set:Nn \l_tmpa_dim { \pgf@x + 0.5 \arrayrulewidth }
 %    \end{macrocode}
@@ -14406,15 +14476,15 @@ version 2005/12/01 or later.
 % Now, the numbers of both rows are in |\l_tmpa_tl| and |\l_tmpb_tl|.
 %    \begin{macrocode}
             \seq_if_in:NxF \l_@@_corners_cells_seq
-              { \l_tmpa_tl - \l_tmpc_tl }
+              { \l_tmpa_tl - \l_@@_tmpc_tl }
               {
                 \@@_qpoint:n { row - \@@_succ:n \l_tmpb_tl }
                 \dim_set:Nn \l_tmpb_dim { \pgf@y + 0.5 \arrayrulewidth }
                 \@@_qpoint:n { row - \l_tmpa_tl }
-                \dim_set:Nn \l_tmpd_dim { \pgf@y + 0.5 \arrayrulewidth }
+                \dim_set:Nn \l_@@_tmpd_dim { \pgf@y + 0.5 \arrayrulewidth }
                 \pgfsetcornersarced { \pgfpoint { #1 } { #1 } } 
                 \pgfpathrectanglecorners
-                  { \pgfpoint \l_tmpc_dim \l_tmpd_dim }
+                  { \pgfpoint \l_@@_tmpc_dim \l_@@_tmpd_dim }
                   { \pgfpoint \l_tmpa_dim \l_tmpb_dim } 
               }
           }
@@ -14647,7 +14717,9 @@ version 2005/12/01 or later.
 %    \begin{macrocode}
     tikz .tl_set:N = \l_@@_tikz_rule_tl , 
     tikz .value_required:n = true ,
-    tikz .initial:n = 
+    tikz .initial:n = ,
+    width .dim_set:N = \l_@@_rule_width_dim ,
+    width .value_required:n = true 
   }
 %    \end{macrocode}
 % 
@@ -14685,7 +14757,7 @@ version 2005/12/01 or later.
 %    \end{macrocode}
 % |\l_tmpa_tl| is the number of row and |\l_tmpb_tl| the number of column. When
 % we have found a row corresponding to a rule to draw, we note its number in
-% |\l_tmpc_tl|. 
+% |\l_@@_tmpc_tl|. 
 %    \begin{macrocode}
     \tl_set:Nx \l_tmpb_tl { \int_eval:n \l_@@_position_int }
     \int_step_variable:nnNn \l_@@_start_int \l_@@_end_int 
@@ -14791,7 +14863,7 @@ version 2005/12/01 or later.
     \@@_qpoint:n { col - \int_use:N \l_@@_position_int }
     \dim_set_eq:NN \l_tmpb_dim \pgf@x
     \@@_qpoint:n { row - \int_eval:n { \l_@@_local_end_int + 1 } }
-    \dim_set_eq:NN \l_tmpc_dim \pgf@y
+    \dim_set_eq:NN \l_@@_tmpc_dim \pgf@y
     \bool_lazy_all:nT
       {
         { \int_compare_p:nNn \l_@@_multiplicity_int > 1 }
@@ -14802,26 +14874,26 @@ version 2005/12/01 or later.
         \group_begin:
         \CT@drsc@
         \dim_add:Nn \l_tmpa_dim { 0.5 \arrayrulewidth }
-        \dim_sub:Nn \l_tmpc_dim { 0.5 \arrayrulewidth }
-        \dim_set:Nn \l_tmpd_dim
+        \dim_sub:Nn \l_@@_tmpc_dim { 0.5 \arrayrulewidth }
+        \dim_set:Nn \l_@@_tmpd_dim
           { 
             \l_tmpb_dim - ( \doublerulesep + \arrayrulewidth ) 
             * ( \l_@@_multiplicity_int - 1 ) 
           } 
         \pgfpathrectanglecorners
           { \pgfpoint \l_tmpb_dim \l_tmpa_dim }
-          { \pgfpoint \l_tmpd_dim \l_tmpc_dim }
+          { \pgfpoint \l_@@_tmpd_dim \l_@@_tmpc_dim }
         \pgfusepath { fill }
         \group_end:
       } 
     \pgfpathmoveto { \pgfpoint \l_tmpb_dim \l_tmpa_dim }
-    \pgfpathlineto { \pgfpoint \l_tmpb_dim \l_tmpc_dim }
+    \pgfpathlineto { \pgfpoint \l_tmpb_dim \l_@@_tmpc_dim }
     \prg_replicate:nn { \l_@@_multiplicity_int - 1 }
       {
         \dim_sub:Nn \l_tmpb_dim \arrayrulewidth
         \dim_sub:Nn \l_tmpb_dim \doublerulesep
         \pgfpathmoveto { \pgfpoint \l_tmpb_dim \l_tmpa_dim }
-        \pgfpathlineto { \pgfpoint \l_tmpb_dim \l_tmpc_dim }
+        \pgfpathlineto { \pgfpoint \l_tmpb_dim \l_@@_tmpc_dim }
       }
     \CT@arc@
     \pgfsetlinewidth { 1.1 \arrayrulewidth }
@@ -14866,13 +14938,13 @@ version 2005/12/01 or later.
     \@@_qpoint:n { row - \int_use:N \l_@@_local_start_int }
     \dim_set_eq:NN \l_tmpa_dim \pgf@y
     \@@_qpoint:n { col - \int_use:N \l_@@_position_int }
-    \dim_set_eq:NN \l_tmpb_dim \pgf@x
+    \dim_set:Nn \l_tmpb_dim { \pgf@x - 0.5 \l_@@_rule_width_dim }
     \@@_qpoint:n { row - \int_eval:n { \l_@@_local_end_int + 1 } }
-    \dim_set_eq:NN \l_tmpc_dim \pgf@y
+    \dim_set_eq:NN \l_@@_tmpc_dim \pgf@y
     \exp_args:NV \tikzset \l_@@_tikz_rule_tl
     \use:x { \exp_not:N \draw [ \l_@@_tikz_rule_tl ] } 
       ( \l_tmpb_dim , \l_tmpa_dim ) --
-      ( \l_tmpb_dim , \l_tmpc_dim ) ;
+      ( \l_tmpb_dim , \l_@@_tmpc_dim ) ;
     \end { tikzpicture }
   }
 %    \end{macrocode}
@@ -14934,7 +15006,7 @@ version 2005/12/01 or later.
 %    \end{macrocode}
 % |\l_tmpa_tl| is the number of row and |\l_tmpb_tl| the number of column. When
 % we have found a column corresponding to a rule to draw, we note its number in
-% |\l_tmpc_tl|. 
+% |\l_@@_tmpc_tl|. 
 %    \begin{macrocode}
     \tl_set:Nx \l_tmpa_tl { \int_use:N \l_@@_position_int }
     \int_step_variable:nnNn \l_@@_start_int \l_@@_end_int
@@ -15039,7 +15111,7 @@ version 2005/12/01 or later.
     \@@_qpoint:n { row - \int_use:N \l_@@_position_int }
     \dim_set_eq:NN \l_tmpb_dim \pgf@y
     \@@_qpoint:n { col - \int_eval:n { \l_@@_local_end_int + 1 } }
-    \dim_set_eq:NN \l_tmpc_dim \pgf@x
+    \dim_set_eq:NN \l_@@_tmpc_dim \pgf@x
     \bool_lazy_all:nT
       { 
         { \int_compare_p:nNn \l_@@_multiplicity_int > 1 }
@@ -15049,25 +15121,25 @@ version 2005/12/01 or later.
       {
         \group_begin:
         \CT@drsc@
-        \dim_set:Nn \l_tmpd_dim
+        \dim_set:Nn \l_@@_tmpd_dim
           { 
             \l_tmpb_dim - ( \doublerulesep + \arrayrulewidth ) 
             * ( \l_@@_multiplicity_int - 1 ) 
           } 
         \pgfpathrectanglecorners
           { \pgfpoint \l_tmpa_dim \l_tmpb_dim }
-          { \pgfpoint \l_tmpc_dim \l_tmpd_dim }
+          { \pgfpoint \l_@@_tmpc_dim \l_@@_tmpd_dim }
         \pgfusepathqfill
         \group_end:
       } 
     \pgfpathmoveto { \pgfpoint \l_tmpa_dim \l_tmpb_dim }
-    \pgfpathlineto { \pgfpoint \l_tmpc_dim \l_tmpb_dim }
+    \pgfpathlineto { \pgfpoint \l_@@_tmpc_dim \l_tmpb_dim }
     \prg_replicate:nn { \l_@@_multiplicity_int - 1 }
       {
         \dim_sub:Nn \l_tmpb_dim \arrayrulewidth
         \dim_sub:Nn \l_tmpb_dim \doublerulesep
         \pgfpathmoveto { \pgfpoint \l_tmpa_dim \l_tmpb_dim }
-        \pgfpathlineto { \pgfpoint \l_tmpc_dim \l_tmpb_dim }
+        \pgfpathlineto { \pgfpoint \l_@@_tmpc_dim \l_tmpb_dim }
       }
     \CT@arc@
     \pgfsetlinewidth { 1.1 \arrayrulewidth }
@@ -15175,13 +15247,13 @@ version 2005/12/01 or later.
     \@@_qpoint:n { col - \int_use:N \l_@@_local_start_int }
     \dim_set_eq:NN \l_tmpa_dim \pgf@x
     \@@_qpoint:n { row - \int_use:N \l_@@_position_int }
-    \dim_set_eq:NN \l_tmpb_dim \pgf@y
+    \dim_set:Nn \l_tmpb_dim { \pgf@y - 0.5 \l_@@_rule_width_dim }
     \@@_qpoint:n { col - \int_eval:n { \l_@@_local_end_int + 1 } }
-    \dim_set_eq:NN \l_tmpc_dim \pgf@x
+    \dim_set_eq:NN \l_@@_tmpc_dim \pgf@x
     \exp_args:NV \tikzset \l_@@_tikz_rule_tl
     \use:x { \exp_not:N \draw [ \l_@@_tikz_rule_tl ] } 
       ( \l_tmpa_dim , \l_tmpb_dim ) --
-      ( \l_tmpc_dim , \l_tmpb_dim ) ;
+      ( \l_@@_tmpc_dim , \l_tmpb_dim ) ;
     \end { tikzpicture }
   }
 %    \end{macrocode}
@@ -15279,15 +15351,46 @@ version 2005/12/01 or later.
 % 
 % \medskip
 % The following command will create the customized rule (it is executed when the
-% final user uses the key |custom-line| in |\NiceMatrixOption|). 
+% final user uses the key |custom-line| in |\NiceMatrixOptions|). 
 %    \begin{macrocode}
 \cs_new_protected:Npn \@@_custom_line:n #1 
   {
+    \str_clear_new:N \l_@@_command_str
+    \str_clear_new:N \l_@@_letter_str
+    \dim_zero_new:N \l_@@_rule_width_dim 
+%    \end{macrocode}
+% The token list |\l_tmpa_tl| is for the key |color|.
+%    \begin{macrocode}
+    \tl_clear:N \l_tmpa_tl
+%    \end{macrocode}
+% The flag |\l_tmpa_bool| will indicate whether the key |tikz| is present.
+%    \begin{macrocode}
+    \bool_set_false:N \l_tmpa_bool
+%    \end{macrocode}
+% The flag |\l_tmpb_bool| will indicate whether the key |width| is present.
+%    \begin{macrocode}
+    \bool_set_false:N \l_tmpb_bool
     \keys_set_known:nn { NiceMatrix / Custom-Line } { #1 } 
+    \bool_if:NT \l_tmpa_bool 
+      {
+%    \end{macrocode}
+% We can't use |\c_@@_tikz_loaded_bool| to test whether \pkg{tikz} is loaded
+% because |\NiceMatrixOptions| may be used in the preamble of the document.
+%    \begin{macrocode}
+        \cs_if_exist:NF \tikzpicture
+          { \@@_error:n { tikz~in~custom-line~without~tikz } }
+        \tl_if_empty:NF \l_tmpa_tl 
+          { \@@_error:n { color~in~custom-line~with~tikz } }
+      }
+    \bool_if:NT \l_tmpb_bool
+      { 
+        \bool_if:NF \l_tmpa_bool 
+          { \@@_error:n { key~width~without~key~tikz } }
+      }
 %    \end{macrocode}
 % If the final user only wants to draw horizontal rules, he does not need to
 % specify a letter (for the vertical rules in the preamble of the array). On the
-% other hand, if he only wants to draw vertical rules, the does not need to
+% other hand, if he only wants to draw vertical rules, he does not need to
 % define a command (which is the tool to draw horizontal rules in the array). Of
 % course, a definition of custom lines with no letter and no command would be point-less.
 % 
@@ -15315,7 +15418,24 @@ version 2005/12/01 or later.
               { \@@_error:n { Several~letters } }
           }
         \str_if_empty:NF \l_@@_command_str
-          { \exp_args:NnV \@@_define_h_custom_line:nn { #1 } \l_tmpc_int }
+          { 
+%    \end{macrocode}
+% The flag |\l_tmpa_bool| means that the key 'tikz' have been used. When the key
+% 'tikz' has not been used, the width of the rule is computed with the
+% multiplicity of the rule.
+%    \begin{macrocode}
+            \bool_if:NF \l_tmpa_bool
+              { 
+                \dim_set:Nn \l_@@_rule_width_dim 
+                  { 
+                    \arrayrulewidth * \l_@@_tmpc_int 
+                    + \doublerulesep * ( \l_@@_tmpc_int - 1 ) 
+                  }
+              }
+            \exp_args:NnV \@@_define_h_custom_line:nn 
+              { #1 }
+              \l_@@_rule_width_dim 
+          }
       }
   }
 %    \end{macrocode}
@@ -15329,47 +15449,52 @@ version 2005/12/01 or later.
 % However, the whole definition of the customized lines (as provided by the
 % final user as argument of |custom-line|) will also be used further with
 % other sets of keys (for instance |{NiceMatrix/Rules}|). That's why the
-% following set of keys has only entries for three keys. 
+% following set of keys has only entries for a few keys. 
 %    \begin{macrocode}
 \keys_define:nn { NiceMatrix / Custom-Line }
   {
     letter .str_set:N = \l_@@_letter_str , 
     letter .value_required:n = true ,
-    letter .initial:n = ,
     command .str_set:N = \l_@@_command_str , 
     command .value_required:n = true , 
-    command .initial:n = ,
+    multiplicity .int_set:N = \l_@@_tmpc_int , 
+    multiplicity .initial:n = 1 , 
+    multiplicity .value_required:n = true ,
+    color .tl_set:N = \l_tmpa_tl , 
+    color. value_required:n = true ,  
 %    \end{macrocode}
-% We need to know the multiplicity of the rule right now in order to compute the
-% total width of the rule (and reserve space both in vertical and horizontal rules).
+% When the key |tikz| is used, the rule will be drawn with Tikz by using the set
+% of keys specified in the value of that key |tikz|.
 %    \begin{macrocode}
-    multiplicity .int_set:N = \l_tmpc_int , 
-    multiplicity .initial:n = 1 , 
-    multiplicity .value_required:n = true , 
+    tikz .code:n = \bool_set_true:N \l_tmpa_bool ,
+%    \end{macrocode}
+% The key |width| must be used only when the key |tikz| is used. When used, the
+% key |width| specifies the width of the rule: it will be used to reserve space
+% (in the preamble of the array or in the command for the horizontal rules).
+%    \begin{macrocode}
+    width .code:n = \dim_set:Nn \l_@@_rule_width_dim { #1 } 
+                    \bool_set_true:N \l_tmpb_bool ,
+    width .value_required:n = true , 
   }
 %    \end{macrocode}
 % 
 % \bigskip
 % The following command will create the command that the final user will use in
 % its array to draw a horizontal rule (hence the `|h|` in the name). |#1| is the
-% whole set of keys to pass to |\@@_line:n| and |#2| is the multiplicity of
-% the line (number of consecutive rules).
+% whole set of keys to pass to |\@@_line:n| and |#2| is the widht of the whole
+% rule. 
 %    \begin{macrocode}
 \cs_new_protected:Npn \@@_define_h_custom_line:nn #1 #2 
   {
 %    \end{macrocode}
-% We use |\cs_set:cpn| and not |\cs_new:cpn| because we want a local définition.
+% We use |\cs_set:cpn| and not |\cs_new:cpn| because we want a local definition.
 % Moreover, the command must \emph{not} be protected since it begins with |\noalign|.
 %    \begin{macrocode}
     \cs_set:cpn \l_@@_command_str
       { 
         \noalign
           {
-            \skip_vertical:n 
-              { 
-                \dim_eval:n 
-                  { \arrayrulewidth * #2 + \doublerulesep * ( #2 - 1) }  
-              } 
+            \skip_vertical:n { #2 }
             \tl_gput_right:Nx \g_@@_internal_code_after_tl
               { \@@_hline:n { #1 , position = \int_eval:n { \c@iRow + 1 } } }
           }
@@ -15377,24 +15502,26 @@ version 2005/12/01 or later.
   }
 %    \end{macrocode}
 % 
+% The flag |\l_tmpa_bool| means that the key 'tikz' have been used. When the key
+% 'tikz' has not been used, the width of the rule is computed with the
+% multiplicity of the rule.
 %    \begin{macrocode}
 \cs_new_protected:Npn \@@_custom_line_i:n #1 
   {
+    \bool_if:NF \l_tmpa_bool
+      {
+        \dim_set:Nn \l_@@_rule_width_dim 
+          { 
+            \arrayrulewidth * \l_@@_tmpc_int
+            + \doublerulesep * ( \l_@@_tmpc_int - 1)  
+          } 
+      }
     \tl_gput_right:Nx \g_@@_preamble_tl
       { 
         \exp_not:N ! 
-          { 
-            \skip_horizontal:n 
-              { 
-                \dim_eval:n 
-                  { 
-                    \arrayrulewidth * \l_tmpc_int
-                    + \doublerulesep * ( \l_tmpc_int - 1)  
-                  } 
-              } 
-          } 
+          { \skip_horizontal:n { \dim_use:N \l_@@_rule_width_dim } } 
       }
-    \tl_gput_right:Nx \g_@@_internal_code_after_tl
+     \tl_gput_right:Nx \g_@@_internal_code_after_tl
       { \@@_vline:n { #1 , position = \@@_succ:n \c@jCol } }
   }
 %    \end{macrocode}
@@ -16833,9 +16960,9 @@ version 2005/12/01 or later.
       \@@_qpoint:n { col - #2 } 
       \dim_set_eq:NN \l_tmpb_dim \pgf@x
       \@@_qpoint:n { row - \@@_succ:n { \l_@@_last_row_int } } 
-      \dim_set_eq:NN \l_tmpc_dim \pgf@y
+      \dim_set_eq:NN \l_@@_tmpc_dim \pgf@y
       \@@_qpoint:n { col - \@@_succ:n { \l_@@_last_col_int } } 
-      \dim_set_eq:NN \l_tmpd_dim \pgf@x
+      \dim_set_eq:NN \l_@@_tmpd_dim \pgf@x
 %    \end{macrocode}
 %
 % We construct the node for the block with the name |(#1-#2-block)|.
@@ -16845,7 +16972,7 @@ version 2005/12/01 or later.
 %    \begin{macrocode}
       \@@_pgf_rect_node:nnnnn
         { \@@_env: - #1 - #2 - block }
-        \l_tmpb_dim \l_tmpa_dim \l_tmpd_dim \l_tmpc_dim 
+        \l_tmpb_dim \l_tmpa_dim \l_@@_tmpd_dim \l_@@_tmpc_dim 
       \str_if_empty:NF \l_@@_block_name_str
         {
           \pgfnodealias 
@@ -16902,7 +17029,7 @@ version 2005/12/01 or later.
               \@@_qpoint:n { col - #2 } 
               \dim_set_eq:NN \l_tmpb_dim \pgf@x
             }
-          \dim_set:Nn \l_tmpd_dim { - \c_max_dim }
+          \dim_set:Nn \l_@@_tmpd_dim { - \c_max_dim }
           \int_step_inline:nnn \l_@@_first_row_int \g_@@_row_total_int
             {
               \cs_if_exist:cT
@@ -16913,18 +17040,18 @@ version 2005/12/01 or later.
                       \pgfpointanchor 
                         { \@@_env: - ##1 - \int_use:N \l_@@_last_col_int }  
                         { east } 
-                      \dim_set:Nn \l_tmpd_dim { \dim_max:nn \l_tmpd_dim \pgf@x }
+                      \dim_set:Nn \l_@@_tmpd_dim { \dim_max:nn \l_@@_tmpd_dim \pgf@x }
                     }
                 }
             }
-          \dim_compare:nNnT \l_tmpd_dim = { - \c_max_dim }
+          \dim_compare:nNnT \l_@@_tmpd_dim = { - \c_max_dim }
             {
               \@@_qpoint:n { col - \@@_succ:n { \l_@@_last_col_int } } 
-              \dim_set_eq:NN \l_tmpd_dim \pgf@x
+              \dim_set_eq:NN \l_@@_tmpd_dim \pgf@x
             }
           \@@_pgf_rect_node:nnnnn
             { \@@_env: - #1 - #2 - block - short }
-            \l_tmpb_dim \l_tmpa_dim \l_tmpd_dim \l_tmpc_dim 
+            \l_tmpb_dim \l_tmpa_dim \l_@@_tmpd_dim \l_@@_tmpc_dim 
         }
 %    \end{macrocode}
 % 
@@ -17106,7 +17233,7 @@ version 2005/12/01 or later.
         \@@_qpoint:n { row - \l_tmpa_tl } 
         \dim_set:Nn \l_tmpb_dim { \pgf@y }
         \@@_qpoint:n { col - \l_tmpb_tl }
-        \dim_set:Nn \l_tmpc_dim { \pgf@x }
+        \dim_set:Nn \l_@@_tmpc_dim { \pgf@x }
         \@@_cut_on_hyphen:w #3 \q_stop
         \int_compare:nNnT \l_tmpa_tl > \c@iRow
           { \tl_set:Nx \l_tmpa_tl { \int_use:N \c@iRow } }
@@ -17115,10 +17242,10 @@ version 2005/12/01 or later.
         \@@_qpoint:n { row - \@@_succ:n \l_tmpa_tl }
         \dim_set:Nn \l_tmpa_dim { \pgf@y } 
         \@@_qpoint:n { col - \@@_succ:n \l_tmpb_tl }
-        \dim_set:Nn \l_tmpd_dim { \pgf@x }
+        \dim_set:Nn \l_@@_tmpd_dim { \pgf@x }
         \pgfpathrectanglecorners
-          { \pgfpoint \l_tmpc_dim \l_tmpb_dim }
-          { \pgfpoint \l_tmpd_dim \l_tmpa_dim }
+          { \pgfpoint \l_@@_tmpc_dim \l_tmpb_dim }
+          { \pgfpoint \l_@@_tmpd_dim \l_tmpa_dim }
         \pgfsetlinewidth { 1.1 \l_@@_line_width_dim }
 %    \end{macrocode}
 % We can't use |\pgfusepathqstroke| because of the key |rounded-corners|.
@@ -17155,19 +17282,19 @@ version 2005/12/01 or later.
     \dim_set_eq:NN \l_@@_line_width_dim \arrayrulewidth
     \keys_set_known:nn { NiceMatrix / BlockBorders } { #1 }
     \@@_cut_on_hyphen:w #2 \q_stop
-    \tl_set_eq:NN \l_tmpc_tl \l_tmpa_tl
-    \tl_set_eq:NN \l_tmpd_tl \l_tmpb_tl
+    \tl_set_eq:NN \l_@@_tmpc_tl \l_tmpa_tl
+    \tl_set_eq:NN \l_@@_tmpd_tl \l_tmpb_tl
     \@@_cut_on_hyphen:w #3 \q_stop
     \tl_set:Nx \l_tmpa_tl { \int_eval:n { \l_tmpa_tl + 1 } }
     \tl_set:Nx \l_tmpb_tl { \int_eval:n { \l_tmpb_tl + 1 } }
-    \int_step_inline:nnn \l_tmpd_tl \l_tmpb_tl
+    \int_step_inline:nnn \l_@@_tmpd_tl \l_tmpb_tl
       { 
         \use:x 
           { 
             \@@_vline:n
               { 
                 position = ##1 ,
-                start = \l_tmpc_tl ,
+                start = \l_@@_tmpc_tl ,
                 end = \@@_pred:n \l_tmpa_tl 
               }
           } 
@@ -17178,19 +17305,19 @@ version 2005/12/01 or later.
     \dim_set_eq:NN \l_@@_line_width_dim \arrayrulewidth
     \keys_set_known:nn { NiceMatrix / BlockBorders } { #1 }
     \@@_cut_on_hyphen:w #2 \q_stop
-    \tl_set_eq:NN \l_tmpc_tl \l_tmpa_tl
-    \tl_set_eq:NN \l_tmpd_tl \l_tmpb_tl
+    \tl_set_eq:NN \l_@@_tmpc_tl \l_tmpa_tl
+    \tl_set_eq:NN \l_@@_tmpd_tl \l_tmpb_tl
     \@@_cut_on_hyphen:w #3 \q_stop
     \tl_set:Nx \l_tmpa_tl { \int_eval:n { \l_tmpa_tl + 1 } }
     \tl_set:Nx \l_tmpb_tl { \int_eval:n { \l_tmpb_tl + 1 } }
-    \int_step_inline:nnn \l_tmpc_tl \l_tmpa_tl
+    \int_step_inline:nnn \l_@@_tmpc_tl \l_tmpa_tl
       { 
         \use:x 
           { 
             \@@_hline:n 
               { 
                 position = ##1 , 
-                start = \l_tmpd_tl , 
+                start = \l_@@_tmpd_tl , 
                 end = \int_eval:n { \l_tmpb_tl - 1 }
               } 
           }
@@ -17217,8 +17344,8 @@ version 2005/12/01 or later.
               { \@@_error:nn { bad~border } { ##1 } }
           }
         \@@_cut_on_hyphen:w #2 \q_stop
-        \tl_set_eq:NN \l_tmpc_tl \l_tmpa_tl
-        \tl_set_eq:NN \l_tmpd_tl \l_tmpb_tl
+        \tl_set_eq:NN \l_@@_tmpc_tl \l_tmpa_tl
+        \tl_set_eq:NN \l_@@_tmpd_tl \l_tmpb_tl
         \@@_cut_on_hyphen:w #3 \q_stop
         \tl_set:Nx \l_tmpa_tl { \int_eval:n { \l_tmpa_tl + 1 } }
         \tl_set:Nx \l_tmpb_tl { \int_eval:n { \l_tmpb_tl + 1 } }
@@ -17230,11 +17357,11 @@ version 2005/12/01 or later.
         \clist_if_in:NnT \l_@@_borders_clist { right }  
           { \@@_stroke_vertical:n \l_tmpb_tl }
         \clist_if_in:NnT \l_@@_borders_clist { left }  
-          { \@@_stroke_vertical:n \l_tmpd_tl }
+          { \@@_stroke_vertical:n \l_@@_tmpd_tl }
         \clist_if_in:NnT \l_@@_borders_clist { bottom }  
           { \@@_stroke_horizontal:n \l_tmpa_tl }
         \clist_if_in:NnT \l_@@_borders_clist { top }  
-          { \@@_stroke_horizontal:n \l_tmpc_tl }
+          { \@@_stroke_horizontal:n \l_@@_tmpc_tl }
         \endpgfpicture
      }
   }
@@ -17246,13 +17373,13 @@ version 2005/12/01 or later.
 %    \begin{macrocode}
 \cs_new_protected:Npn \@@_stroke_vertical:n #1
   {
-    \@@_qpoint:n \l_tmpc_tl 
+    \@@_qpoint:n \l_@@_tmpc_tl 
     \dim_set:Nn \l_tmpb_dim { \pgf@y + 0.5 \l_@@_line_width_dim }
     \@@_qpoint:n \l_tmpa_tl 
-    \dim_set:Nn \l_tmpc_dim { \pgf@y + 0.5 \l_@@_line_width_dim }
+    \dim_set:Nn \l_@@_tmpc_dim { \pgf@y + 0.5 \l_@@_line_width_dim }
     \@@_qpoint:n { #1 }
     \pgfpathmoveto { \pgfpoint \pgf@x \l_tmpb_dim }
-    \pgfpathlineto { \pgfpoint \pgf@x \l_tmpc_dim }
+    \pgfpathlineto { \pgfpoint \pgf@x \l_@@_tmpc_dim }
     \pgfusepathqstroke
   }
 %    \end{macrocode}
@@ -17263,7 +17390,7 @@ version 2005/12/01 or later.
 %    \begin{macrocode}
 \cs_new_protected:Npn \@@_stroke_horizontal:n #1
   {
-    \@@_qpoint:n \l_tmpd_tl 
+    \@@_qpoint:n \l_@@_tmpd_tl 
     \clist_if_in:NnTF \l_@@_borders_clist { left }
       { \dim_set:Nn \l_tmpa_dim { \pgf@x - 0.5 \l_@@_line_width_dim } }
       { \dim_set:Nn \l_tmpa_dim { \pgf@x + 0.5 \l_@@_line_width_dim } }
@@ -17521,10 +17648,10 @@ version 2005/12/01 or later.
     \dim_set_eq:NN \l_tmpb_dim \pgf@x
     \pgfpathmoveto { \pgfpoint \l_tmpb_dim \l_tmpa_dim }
     \@@_qpoint:n { row - \@@_succ:n { #3 } }
-    \dim_set_eq:NN \l_tmpc_dim \pgf@y 
+    \dim_set_eq:NN \l_@@_tmpc_dim \pgf@y 
     \@@_qpoint:n { col - \@@_succ:n { #4 } }
-    \dim_set_eq:NN \l_tmpd_dim \pgf@x
-    \pgfpathlineto { \pgfpoint \l_tmpd_dim \l_tmpc_dim }
+    \dim_set_eq:NN \l_@@_tmpd_dim \pgf@x
+    \pgfpathlineto { \pgfpoint \l_@@_tmpd_dim \l_@@_tmpc_dim }
     {
 %    \end{macrocode}
 % The command |\CT@arc@| is a command of \pkg{colortbl} which sets the color of
@@ -17537,7 +17664,7 @@ version 2005/12/01 or later.
     }
     \pgfset { inner~sep = 1 pt }
     \pgfscope
-    \pgftransformshift { \pgfpoint \l_tmpb_dim \l_tmpc_dim }
+    \pgftransformshift { \pgfpoint \l_tmpb_dim \l_@@_tmpc_dim }
     \pgfnode { rectangle } { south~west } 
       { 
         \begin { minipage } { 20 cm }
@@ -17547,7 +17674,7 @@ version 2005/12/01 or later.
       { } 
       { }
     \endpgfscope
-    \pgftransformshift { \pgfpoint \l_tmpd_dim \l_tmpa_dim }
+    \pgftransformshift { \pgfpoint \l_@@_tmpd_dim \l_tmpa_dim }
     \pgfnode { rectangle } { north~east } 
       {
         \begin { minipage } { 20 cm }
@@ -17826,13 +17953,13 @@ version 2005/12/01 or later.
     \peek_remove_spaces:n
       {
         \@@_cut_on_hyphen:w #3 \q_stop
-        \tl_clear_new:N \l_tmpc_tl
-        \tl_clear_new:N \l_tmpd_tl
-        \tl_set_eq:NN \l_tmpc_tl \l_tmpa_tl
-        \tl_set_eq:NN \l_tmpd_tl \l_tmpb_tl
+        \tl_clear_new:N \l_@@_tmpc_tl
+        \tl_clear_new:N \l_@@_tmpd_tl
+        \tl_set_eq:NN \l_@@_tmpc_tl \l_tmpa_tl
+        \tl_set_eq:NN \l_@@_tmpd_tl \l_tmpb_tl
         \@@_cut_on_hyphen:w #2 \q_stop
         \seq_gput_right:Nx \g_@@_submatrix_seq
-          { { \l_tmpa_tl } { \l_tmpb_tl } { \l_tmpc_tl } { \l_tmpd_tl } }
+          { { \l_tmpa_tl } { \l_tmpb_tl } { \l_@@_tmpc_tl } { \l_@@_tmpd_tl } } 
         \tl_gput_right:Nn \g_@@_internal_code_after_tl
           { \SubMatrix { #1 } { #2 } { #3 } { #4 } [ #5 ] }
       }
@@ -17854,7 +17981,7 @@ version 2005/12/01 or later.
 % For explanations about the construction with rescanning of the preamble, see
 % the documentation for the user command |\Cdots|.
 %    \begin{macrocode}
-\AtBeginDocument 
+\hook_gput_code:nnn { begindocument } { . } 
   {
     \tl_set:Nn \l_@@_argspec_tl { m m m m O { } E { _ ^ } { { } { } } }
     \tl_set_rescan:Nno  \l_@@_argspec_tl { } \l_@@_argspec_tl
@@ -18564,16 +18691,6 @@ version 2005/12/01 or later.
   }
 %    \end{macrocode}
 %
-% \medskip
-% Maybe we will completely delete the key 'transparent' in a future version. 
-%    \begin{macrocode}
-\@@_msg_new:nn { Key~transparent }
-  {
-    The~key~'transparent'~is~now~obsolete~(because~it's~name~
-    is~not~clear).~You~must~use~the~conjonction~of~'renew-dots'~
-    and~'renew-matrix'.~This~error~is~fatal.
-  }
-%    \end{macrocode}
 %
 %    \begin{macrocode}
 \keys_define:nn { NiceMatrix / Package }
@@ -18949,6 +19066,14 @@ version 2005/12/01 or later.
     If~you~go~on,~it~will~be~ignored.
   }
 %    \end{macrocode}
+%
+%    \begin{macrocode}
+\@@_msg_new:nn { key~width~without~key~tikz }
+  {
+    In~'custom-line',~you~have~used~'width'~without~'tikz'.~That's~not~correct.~
+    If~you~go~on,~that~key~'width'~will~be~discarded.
+  }
+%    \end{macrocode}
 % 
 %    \begin{macrocode}
 \@@_msg_new:nn { Several~letters }
@@ -19142,6 +19267,25 @@ version 2005/12/01 or later.
 %    \end{macrocode}
 %
 %    \begin{macrocode}
+\@@_msg_new:nn { tikz~in~custom-line~without~tikz }
+  {
+    You~have~used~the~key~'tikz'~in~the~definition~of~a~
+    customized~line~(with~'custom-line')~but~Tikz~is~not~loaded.~
+    You~can~go~on~but~you~will~have~another~error~if~you~actually~
+    use~that~custom~line.
+  }
+%    \end{macrocode}
+%
+%    \begin{macrocode}
+\@@_msg_new:nn { color~in~custom-line~with~tikz }
+  {
+    In~a~'custom-line',~you~have~used~both~'tikz'~and~'color',~
+    which~is~forbidden~(you~should~use~'color'~inside~the~key~'tikz').~
+    If~you~go~on,~the~key~'color'~will~be~discarded.
+  }
+%    \end{macrocode}
+% 
+%    \begin{macrocode}
 \@@_msg_new:nn { Wrong~last~row }
   { 
     You~have~used~'last-row=\int_use:N \l_@@_last_row_int'~but~your~
@@ -20107,6 +20251,10 @@ version 2005/12/01 or later.
 %
 % Key |respect-arraystretch|.
 % 
+%
+% \subsection*{Changes between version 6.5 and 6.6}
+%
+% Keys |tikz| and |width| in |custom-line|.
 % \PrintIndex
 % 
 % \tableofcontents
diff --git a/Master/texmf-dist/tex/latex/nicematrix/nicematrix.sty b/Master/texmf-dist/tex/latex/nicematrix/nicematrix.sty
index c20a52be74f..51b0a3e4936 100644
--- a/Master/texmf-dist/tex/latex/nicematrix/nicematrix.sty
+++ b/Master/texmf-dist/tex/latex/nicematrix/nicematrix.sty
@@ -18,8 +18,8 @@
 %% and version 1.3 or later is part of all distributions of
 %% LaTeX version 2005/12/01 or later.
 %% 
-\def\myfileversion{6.5}
-\def\myfiledate{2022/01/23}
+\def\myfileversion{6.6}
+\def\myfiledate{2022/02/16}
 \RequirePackage{pgfcore}
 \usepgfmodule{shapes}
 \RequirePackage{l3keys2e}
@@ -42,14 +42,15 @@
   { \msg_redirect_name:nnn { nicematrix } }
 \bool_new:N \c__nicematrix_in_preamble_bool
 \bool_set_true:N \c__nicematrix_in_preamble_bool
-\AtBeginDocument { \bool_set_false:N \c__nicematrix_in_preamble_bool }
+\hook_gput_code:nnn { begindocument } { . }
+  { \bool_set_false:N \c__nicematrix_in_preamble_bool }
 \bool_new:N \c__nicematrix_arydshln_loaded_bool
 \bool_new:N \c__nicematrix_booktabs_loaded_bool
 \bool_new:N \c__nicematrix_enumitem_loaded_bool
 \bool_new:N \c__nicematrix_tabularx_loaded_bool
 \bool_new:N \c__nicematrix_tikz_loaded_bool
 \bool_new:N \c__nicematrix_varwidth_loaded_bool
-\AtBeginDocument
+\hook_gput_code:nnn { begindocument } { . }
   {
     \@ifpackageloaded { varwidth }
       { \bool_set_true:N \c__nicematrix_varwidth_loaded_bool }
@@ -112,7 +113,7 @@
         \tex_mkern:D 1 mu
       }
   }
-\AtBeginDocument
+\hook_gput_code:nnn { begindocument } { . }
   {
     \@ifpackageloaded { booktabs }
       { \iow_now:Nn \@mainaux \nicematrix@redefine@check@rerun }
@@ -128,7 +129,7 @@
       }
   }
 \bool_new:N \c__nicematrix_colortbl_loaded_bool
-\AtBeginDocument
+\hook_gput_code:nnn { begindocument } { . }
   {
     \@ifpackageloaded { colortbl }
       { \bool_set_true:N \c__nicematrix_colortbl_loaded_bool }
@@ -217,13 +218,13 @@
   { \cs_set:Npn \CT@drsc@ { \color { #1 } } }
 \cs_set_eq:NN \__nicematrix_old_pgfpointanchor \pgfpointanchor
 \bool_new:N \c__nicematrix_siunitx_loaded_bool
-\AtBeginDocument
+\hook_gput_code:nnn { begindocument } { . }
   {
     \@ifpackageloaded { siunitx }
       { \bool_set_true:N \c__nicematrix_siunitx_loaded_bool }
       { }
   }
-\AtBeginDocument
+\hook_gput_code:nnn { begindocument } { . }
   {
     \bool_if:nTF { ! \c__nicematrix_siunitx_loaded_bool }
       { \cs_set_eq:NN \__nicematrix_renew_NC@rewrite@S: \prg_do_nothing: }
@@ -304,8 +305,8 @@
 \dim_new:N \l__nicematrix_y_initial_dim
 \dim_new:N \l__nicematrix_x_final_dim
 \dim_new:N \l__nicematrix_y_final_dim
-\dim_zero_new:N \l_tmpc_dim
-\dim_zero_new:N \l_tmpd_dim
+\dim_zero_new:N \l__nicematrix_tmpc_dim
+\dim_zero_new:N \l__nicematrix_tmpd_dim
 \bool_new:N \g__nicematrix_empty_cell_bool
 \dim_new:N \g__nicematrix_width_last_col_dim
 \dim_new:N \g__nicematrix_width_first_col_dim
@@ -391,7 +392,7 @@
 \cs_new:Npn \__nicematrix_notes_label_in_tabular:n #1 { \textsuperscript { #1 } }
 \cs_new:Npn \__nicematrix_notes_label_in_list:n #1 { \textsuperscript { #1 } }
 \cs_set:Npn \thetabularnote { { \__nicematrix_notes_style:n { tabularnote } } }
-\AtBeginDocument
+\hook_gput_code:nnn { begindocument } { . }
   {
     \bool_if:nTF { ! \c__nicematrix_enumitem_loaded_bool }
       {
@@ -505,11 +506,14 @@
 \dim_new:N \l__nicematrix_cell_space_top_limit_dim
 \dim_new:N \l__nicematrix_cell_space_bottom_limit_dim
 \dim_new:N \l__nicematrix_inter_dots_dim
-\AtBeginDocument { \dim_set:Nn \l__nicematrix_inter_dots_dim { 0.45 em } }
+\hook_gput_code:nnn { begindocument } { . }
+  { \dim_set:Nn \l__nicematrix_inter_dots_dim { 0.45 em } }
 \dim_new:N \l__nicematrix_xdots_shorten_dim
-\AtBeginDocument { \dim_set:Nn \l__nicematrix_xdots_shorten_dim { 0.3 em } }
+\hook_gput_code:nnn { begindocument } { . }
+  { \dim_set:Nn \l__nicematrix_xdots_shorten_dim { 0.3 em } }
 \dim_new:N \l__nicematrix_radius_dim
-\AtBeginDocument { \dim_set:Nn \l__nicematrix_radius_dim { 0.53 pt } }
+\hook_gput_code:nnn { begindocument } { . }
+  { \dim_set:Nn \l__nicematrix_radius_dim { 0.53 pt } }
 \tl_new:N \l__nicematrix_xdots_line_style_tl
 \tl_const:Nn \c__nicematrix_standard_tl { standard }
 \tl_set_eq:NN \l__nicematrix_xdots_line_style_tl \c__nicematrix_standard_tl
@@ -521,7 +525,8 @@
 \bool_set_true:N \l__nicematrix_parallelize_diags_bool
 \clist_new:N \l__nicematrix_corners_clist
 \dim_new:N \l__nicematrix_notes_above_space_dim
-\AtBeginDocument { \dim_set:Nn \l__nicematrix_notes_above_space_dim { 1 mm } }
+\hook_gput_code:nnn { begindocument } { . }
+  { \dim_set:Nn \l__nicematrix_notes_above_space_dim { 1 mm } }
 \bool_new:N \l__nicematrix_nullify_dots_bool
 \bool_new:N \l__nicematrix_respect_arraystretch_bool
 \bool_new:N \l__nicematrix_auto_columns_width_bool
@@ -714,7 +719,7 @@
       {
         \bool_if:NTF \c__nicematrix_in_preamble_bool
           {
-            \AtBeginDocument
+            \hook_gput_code:nnn { begindocument } { . }
               {
                 \bool_if:NT \c__nicematrix_enumitem_loaded_bool
                   { \setlist* [ tabularnotes ] { #1 } }
@@ -730,7 +735,7 @@
       {
         \bool_if:NTF \c__nicematrix_in_preamble_bool
           {
-            \AtBeginDocument
+            \hook_gput_code:nnn { begindocument } { . }
               {
                 \bool_if:NT \c__nicematrix_enumitem_loaded_bool
                   { \setlist* [ tabularnotes* ] { #1 } }
@@ -806,13 +811,6 @@
     small .value_forbidden:n = true ,
     renew-matrix .code:n = \__nicematrix_renew_matrix: ,
     renew-matrix .value_forbidden:n = true ,
-    transparent .code:n =
-      {
-        \__nicematrix_renew_matrix:
-        \bool_set_true:N \l__nicematrix_renew_dots_bool
-        \__nicematrix_error:n { Key~transparent }
-      } ,
-    transparent .value_forbidden:n = true,
     exterior-arraycolsep .bool_set:N = \l__nicematrix_exterior_arraycolsep_bool ,
     columns-width .code:n =
       \tl_if_eq:nnTF { #1 } { auto }
@@ -1261,7 +1259,7 @@
     \bool_if:NT \l__nicematrix_colortbl_like_bool \__nicematrix_colortbl_like:
     \bool_if:NT \l__nicematrix_renew_dots_bool \__nicematrix_renew_dots:
     \cs_set_eq:NN \multicolumn \__nicematrix_multicolumn:nnn
-    \AtBeginEnvironment { tabular }
+    \hook_gput_code:nnn { env / tabular / begin } { . }
       { \cs_set_eq:NN \multicolumn \__nicematrix_old_multicolumn }
     \seq_gclear:N \g__nicematrix_multicolumn_cells_seq
     \seq_gclear:N \g__nicematrix_multicolumn_sizes_seq
@@ -1480,15 +1478,15 @@
         \__nicematrix_qpoint:n { #1 }
         \dim_set_eq:NN \l_tmpb_dim \pgf@y
         \__nicematrix_qpoint:n { col - \__nicematrix_succ:n { #4 } }
-        \dim_set_eq:NN \l_tmpc_dim \pgf@x
+        \dim_set_eq:NN \l__nicematrix_tmpc_dim \pgf@x
         \__nicematrix_qpoint:n { \__nicematrix_succ:n { #3 } }
-        \dim_set_eq:NN \l_tmpd_dim \pgf@y
+        \dim_set_eq:NN \l__nicematrix_tmpd_dim \pgf@y
         \__nicematrix_pgf_rect_node:nnnnn
           { \__nicematrix_env: - #5 }
           { \dim_use:N \l_tmpa_dim }
           { \dim_use:N \l_tmpb_dim }
-          { \dim_use:N \l_tmpc_dim }
-          { \dim_use:N \l_tmpd_dim }
+          { \dim_use:N \l__nicematrix_tmpc_dim }
+          { \dim_use:N \l__nicematrix_tmpd_dim }
       }
   }
 \cs_new_protected:Npn \__nicematrix_patch_for_revtex:
@@ -3189,7 +3187,7 @@
     }
     { #5 }
   }
-\AtBeginDocument
+\hook_gput_code:nnn { begindocument } { . }
   {
     \cs_new_protected:Npx \__nicematrix_draw_dotted_lines:
       {
@@ -3235,12 +3233,12 @@
         \__nicematrix_qpoint:n { row - \int_min:nn { ##1 } { \c@iRow + 1 } }
         \dim_set_eq:NN \l_tmpb_dim \pgf@y
         \__nicematrix_qpoint:n { col - \int_min:nn { ##1 + 1 } { \c@jCol + 1 } }
-        \dim_set_eq:NN \l_tmpc_dim \pgf@x
+        \dim_set_eq:NN \l__nicematrix_tmpc_dim \pgf@x
         \__nicematrix_qpoint:n { row - \int_min:nn { ##1 + 1 } { \c@iRow + 1 } }
-        \dim_set_eq:NN \l_tmpd_dim \pgf@y
+        \dim_set_eq:NN \l__nicematrix_tmpd_dim \pgf@y
         \pgftransformshift { \pgfpoint \l_tmpa_dim \l_tmpb_dim }
-        \dim_set:Nn \l_tmpa_dim { ( \l_tmpc_dim - \l_tmpa_dim ) / 2 }
-        \dim_set:Nn \l_tmpb_dim { ( \l_tmpd_dim - \l_tmpb_dim ) / 2 }
+        \dim_set:Nn \l_tmpa_dim { ( \l__nicematrix_tmpc_dim - \l_tmpa_dim ) / 2 }
+        \dim_set:Nn \l_tmpb_dim { ( \l__nicematrix_tmpd_dim - \l_tmpb_dim ) / 2 }
         \pgfnode { __nicematrix_diag_node } { center } { } { \__nicematrix_env: - ##1 } { }
         \str_if_empty:NF \l__nicematrix_name_str
           { \pgfnodealias { \l__nicematrix_name_str - ##1 } { \__nicematrix_env: - ##1 } }
@@ -3994,7 +3992,7 @@
       }
     \pgfusepathqfill
   }
-\AtBeginDocument
+\hook_gput_code:nnn { begindocument } { . }
   {
     \tl_set:Nn \l__nicematrix_argspec_tl { O { } E { _ ^ } { { } { } } }
     \tl_set_rescan:Nno  \l__nicematrix_argspec_tl { } \l__nicematrix_argspec_tl
@@ -4124,7 +4122,7 @@
         \__nicematrix_Hdotsfor_i
       }
   }
-\AtBeginDocument
+\hook_gput_code:nnn { begindocument } { . }
   {
     \tl_set:Nn \l__nicematrix_argspec_tl { O { } m O { } E { _ ^ } { { } { } } }
     \tl_set_rescan:Nno \l__nicematrix_argspec_tl { } \l__nicematrix_argspec_tl
@@ -4201,7 +4199,7 @@
     \int_step_inline:nnn { #2 } { #2 + #3 - 1 }
       { \cs_set:cpn { __nicematrix _ dotted _ #1 - ##1 } { } }
   }
-\AtBeginDocument
+\hook_gput_code:nnn { begindocument } { . }
   {
     \tl_set:Nn \l__nicematrix_argspec_tl { O { } m O { } E { _ ^ } { { } { } } }
     \tl_set_rescan:Nno  \l__nicematrix_argspec_tl { } \l__nicematrix_argspec_tl
@@ -4279,7 +4277,7 @@
 \cs_new_protected:Npn \__nicematrix_rotate: { \bool_gset_true:N \g__nicematrix_rotate_bool }
 \cs_new:Npn \__nicematrix_double_int_eval:n #1-#2 \q_stop
   { \int_eval:n { #1 } - \int_eval:n { #2 } }
-\AtBeginDocument
+\hook_gput_code:nnn { begindocument } { . }
   {
     \tl_set:Nn \l__nicematrix_argspec_tl { O { } m m ! O { } E { _ ^ } { { } { } } }
     \tl_set_rescan:Nno  \l__nicematrix_argspec_tl { } \l__nicematrix_argspec_tl
@@ -4312,7 +4310,7 @@
       }
       { \__nicematrix_draw_line_ii:nn { #1 } { #2 } }
   }
-\AtBeginDocument
+\hook_gput_code:nnn { begindocument } { . }
   {
     \cs_new_protected:Npx \__nicematrix_draw_line_ii:nn #1 #2
       {
@@ -4353,7 +4351,7 @@
     nb-rows .int_set:N = \l__nicematrix_key_nb_rows_int ,
     nb-rows .value_required:n = true ,
     nb-rows .initial:n = 1 ,
-    rowcolor .tl_set:N = \l_tmpc_tl ,
+    rowcolor .tl_set:N = \l__nicematrix_tmpc_tl ,
     rowcolor .value_required:n = true ,
     rowcolor .initial:n = ,
     unknown .code:n = \__nicematrix_error:n { Unknown~key~for~RowStyle }
@@ -4361,12 +4359,12 @@
 \NewDocumentCommand \__nicematrix_RowStyle:n { O { } m }
   {
     \keys_set:nn { NiceMatrix / RowStyle } { #1 }
-    \tl_if_empty:NF \l_tmpc_tl
+    \tl_if_empty:NF \l__nicematrix_tmpc_tl
       {
         \tl_gput_right:Nx \g_nicematrix_code_before_tl
           {
             \__nicematrix_rectanglecolor
-              { \l_tmpc_tl }
+              { \l__nicematrix_tmpc_tl }
               { \int_use:N \c@iRow - \int_use:N \c@jCol }
               { \int_use:N \c@iRow - * }
           }
@@ -4375,7 +4373,7 @@
             \tl_gput_right:Nx \g_nicematrix_code_before_tl
               {
                 \__nicematrix_rowcolor
-                  { \l_tmpc_tl }
+                  { \l__nicematrix_tmpc_tl }
                   {
                     \int_eval:n { \c@iRow + 1 }
                     - \int_eval:n { \c@iRow + \l__nicematrix_key_nb_rows_int - 1 }
@@ -4503,13 +4501,13 @@
 \cs_new_protected:Npn \__nicematrix_rectanglecolor:nnn #1 #2 #3
   {
     \__nicematrix_cut_on_hyphen:w #1 \q_stop
-    \tl_clear_new:N \l_tmpc_tl
-    \tl_clear_new:N \l_tmpd_tl
-    \tl_set_eq:NN \l_tmpc_tl \l_tmpa_tl
-    \tl_set_eq:NN \l_tmpd_tl \l_tmpb_tl
+    \tl_clear_new:N \l__nicematrix_tmpc_tl
+    \tl_clear_new:N \l__nicematrix_tmpd_tl
+    \tl_set_eq:NN \l__nicematrix_tmpc_tl \l_tmpa_tl
+    \tl_set_eq:NN \l__nicematrix_tmpd_tl \l_tmpb_tl
     \__nicematrix_cut_on_hyphen:w #2 \q_stop
-    \tl_set:Nx \l__nicematrix_rows_tl { \l_tmpc_tl - \l_tmpa_tl }
-    \tl_set:Nx \l__nicematrix_cols_tl { \l_tmpd_tl - \l_tmpb_tl }
+    \tl_set:Nx \l__nicematrix_rows_tl { \l__nicematrix_tmpc_tl - \l_tmpa_tl }
+    \tl_set:Nx \l__nicematrix_cols_tl { \l__nicematrix_tmpd_tl - \l_tmpb_tl }
     \__nicematrix_cartesian_path:n { #3 }
   }
 \NewDocumentCommand \__nicematrix_cellcolor { O { } m m }
@@ -4573,9 +4571,9 @@
         \bool_if:NTF \l__nicematrix_rowcolors_restart_bool
           { \int_set:Nn \l__nicematrix_color_int 1 }
           { \int_set:Nn \l__nicematrix_color_int \l_tmpa_tl }
-        \int_zero_new:N \l_tmpc_int
-        \int_set:Nn \l_tmpc_int \l_tmpb_tl
-        \int_do_until:nNnn \l_tmpa_int > \l_tmpc_int
+        \int_zero_new:N \l__nicematrix_tmpc_int
+        \int_set:Nn \l__nicematrix_tmpc_int \l_tmpb_tl
+        \int_do_until:nNnn \l_tmpa_int > \l__nicematrix_tmpc_int
           {
             \int_set_eq:NN \l_tmpb_int \l_tmpa_int
             \bool_if:NT \l__nicematrix_respect_blocks_bool
@@ -4667,11 +4665,11 @@
           { \tl_set:Nx \l_tmpb_tl { \int_use:N \c@jCol } }
         \int_compare:nNnT \l_tmpb_tl > \c@jCol
           { \tl_set:Nx \l_tmpb_tl { \int_use:N \c@jCol } }
-        \tl_set_eq:NN \l_tmpc_tl \l_tmpa_tl
+        \tl_set_eq:NN \l__nicematrix_tmpc_tl \l_tmpa_tl
         \__nicematrix_qpoint:n { col - \l_tmpa_tl }
         \int_compare:nNnTF \l__nicematrix_first_col_int = \l_tmpa_tl
-          { \dim_set:Nn \l_tmpc_dim { \pgf@x - 0.5 \arrayrulewidth } }
-          { \dim_set:Nn \l_tmpc_dim { \pgf@x + 0.5 \arrayrulewidth } }
+          { \dim_set:Nn \l__nicematrix_tmpc_dim { \pgf@x - 0.5 \arrayrulewidth } }
+          { \dim_set:Nn \l__nicematrix_tmpc_dim { \pgf@x + 0.5 \arrayrulewidth } }
         \__nicematrix_qpoint:n { col - \__nicematrix_succ:n \l_tmpb_tl }
         \dim_set:Nn \l_tmpa_dim { \pgf@x + 0.5 \arrayrulewidth }
         \clist_map_inline:Nn \l__nicematrix_rows_tl
@@ -4686,15 +4684,15 @@
             \int_compare:nNnT \l_tmpb_tl > \c@iRow
               { \tl_set:Nx \l_tmpb_tl { \int_use:N \c@iRow } }
             \seq_if_in:NxF \l__nicematrix_corners_cells_seq
-              { \l_tmpa_tl - \l_tmpc_tl }
+              { \l_tmpa_tl - \l__nicematrix_tmpc_tl }
               {
                 \__nicematrix_qpoint:n { row - \__nicematrix_succ:n \l_tmpb_tl }
                 \dim_set:Nn \l_tmpb_dim { \pgf@y + 0.5 \arrayrulewidth }
                 \__nicematrix_qpoint:n { row - \l_tmpa_tl }
-                \dim_set:Nn \l_tmpd_dim { \pgf@y + 0.5 \arrayrulewidth }
+                \dim_set:Nn \l__nicematrix_tmpd_dim { \pgf@y + 0.5 \arrayrulewidth }
                 \pgfsetcornersarced { \pgfpoint { #1 } { #1 } }
                 \pgfpathrectanglecorners
-                  { \pgfpoint \l_tmpc_dim \l_tmpd_dim }
+                  { \pgfpoint \l__nicematrix_tmpc_dim \l__nicematrix_tmpd_dim }
                   { \pgfpoint \l_tmpa_dim \l_tmpb_dim }
               }
           }
@@ -4801,7 +4799,9 @@
     sep-color .value_required:n = true ,
     tikz .tl_set:N = \l__nicematrix_tikz_rule_tl ,
     tikz .value_required:n = true ,
-    tikz .initial:n =
+    tikz .initial:n = ,
+    width .dim_set:N = \l__nicematrix_rule_width_dim ,
+    width .value_required:n = true
   }
 \cs_new_protected:Npn \__nicematrix_vline:n #1
   {
@@ -4896,7 +4896,7 @@
     \__nicematrix_qpoint:n { col - \int_use:N \l__nicematrix_position_int }
     \dim_set_eq:NN \l_tmpb_dim \pgf@x
     \__nicematrix_qpoint:n { row - \int_eval:n { \l__nicematrix_local_end_int + 1 } }
-    \dim_set_eq:NN \l_tmpc_dim \pgf@y
+    \dim_set_eq:NN \l__nicematrix_tmpc_dim \pgf@y
     \bool_lazy_all:nT
       {
         { \int_compare_p:nNn \l__nicematrix_multiplicity_int > 1 }
@@ -4907,26 +4907,26 @@
         \group_begin:
         \CT@drsc@
         \dim_add:Nn \l_tmpa_dim { 0.5 \arrayrulewidth }
-        \dim_sub:Nn \l_tmpc_dim { 0.5 \arrayrulewidth }
-        \dim_set:Nn \l_tmpd_dim
+        \dim_sub:Nn \l__nicematrix_tmpc_dim { 0.5 \arrayrulewidth }
+        \dim_set:Nn \l__nicematrix_tmpd_dim
           {
             \l_tmpb_dim - ( \doublerulesep + \arrayrulewidth )
             * ( \l__nicematrix_multiplicity_int - 1 )
           }
         \pgfpathrectanglecorners
           { \pgfpoint \l_tmpb_dim \l_tmpa_dim }
-          { \pgfpoint \l_tmpd_dim \l_tmpc_dim }
+          { \pgfpoint \l__nicematrix_tmpd_dim \l__nicematrix_tmpc_dim }
         \pgfusepath { fill }
         \group_end:
       }
     \pgfpathmoveto { \pgfpoint \l_tmpb_dim \l_tmpa_dim }
-    \pgfpathlineto { \pgfpoint \l_tmpb_dim \l_tmpc_dim }
+    \pgfpathlineto { \pgfpoint \l_tmpb_dim \l__nicematrix_tmpc_dim }
     \prg_replicate:nn { \l__nicematrix_multiplicity_int - 1 }
       {
         \dim_sub:Nn \l_tmpb_dim \arrayrulewidth
         \dim_sub:Nn \l_tmpb_dim \doublerulesep
         \pgfpathmoveto { \pgfpoint \l_tmpb_dim \l_tmpa_dim }
-        \pgfpathlineto { \pgfpoint \l_tmpb_dim \l_tmpc_dim }
+        \pgfpathlineto { \pgfpoint \l_tmpb_dim \l__nicematrix_tmpc_dim }
       }
     \CT@arc@
     \pgfsetlinewidth { 1.1 \arrayrulewidth }
@@ -4958,13 +4958,13 @@
     \__nicematrix_qpoint:n { row - \int_use:N \l__nicematrix_local_start_int }
     \dim_set_eq:NN \l_tmpa_dim \pgf@y
     \__nicematrix_qpoint:n { col - \int_use:N \l__nicematrix_position_int }
-    \dim_set_eq:NN \l_tmpb_dim \pgf@x
+    \dim_set:Nn \l_tmpb_dim { \pgf@x - 0.5 \l__nicematrix_rule_width_dim }
     \__nicematrix_qpoint:n { row - \int_eval:n { \l__nicematrix_local_end_int + 1 } }
-    \dim_set_eq:NN \l_tmpc_dim \pgf@y
+    \dim_set_eq:NN \l__nicematrix_tmpc_dim \pgf@y
     \exp_args:NV \tikzset \l__nicematrix_tikz_rule_tl
     \use:x { \exp_not:N \draw [ \l__nicematrix_tikz_rule_tl ] }
       ( \l_tmpb_dim , \l_tmpa_dim ) --
-      ( \l_tmpb_dim , \l_tmpc_dim ) ;
+      ( \l_tmpb_dim , \l__nicematrix_tmpc_dim ) ;
     \end { tikzpicture }
   }
 \cs_new_protected:Npn \__nicematrix_draw_vlines:
@@ -5077,7 +5077,7 @@
     \__nicematrix_qpoint:n { row - \int_use:N \l__nicematrix_position_int }
     \dim_set_eq:NN \l_tmpb_dim \pgf@y
     \__nicematrix_qpoint:n { col - \int_eval:n { \l__nicematrix_local_end_int + 1 } }
-    \dim_set_eq:NN \l_tmpc_dim \pgf@x
+    \dim_set_eq:NN \l__nicematrix_tmpc_dim \pgf@x
     \bool_lazy_all:nT
       {
         { \int_compare_p:nNn \l__nicematrix_multiplicity_int > 1 }
@@ -5087,25 +5087,25 @@
       {
         \group_begin:
         \CT@drsc@
-        \dim_set:Nn \l_tmpd_dim
+        \dim_set:Nn \l__nicematrix_tmpd_dim
           {
             \l_tmpb_dim - ( \doublerulesep + \arrayrulewidth )
             * ( \l__nicematrix_multiplicity_int - 1 )
           }
         \pgfpathrectanglecorners
           { \pgfpoint \l_tmpa_dim \l_tmpb_dim }
-          { \pgfpoint \l_tmpc_dim \l_tmpd_dim }
+          { \pgfpoint \l__nicematrix_tmpc_dim \l__nicematrix_tmpd_dim }
         \pgfusepathqfill
         \group_end:
       }
     \pgfpathmoveto { \pgfpoint \l_tmpa_dim \l_tmpb_dim }
-    \pgfpathlineto { \pgfpoint \l_tmpc_dim \l_tmpb_dim }
+    \pgfpathlineto { \pgfpoint \l__nicematrix_tmpc_dim \l_tmpb_dim }
     \prg_replicate:nn { \l__nicematrix_multiplicity_int - 1 }
       {
         \dim_sub:Nn \l_tmpb_dim \arrayrulewidth
         \dim_sub:Nn \l_tmpb_dim \doublerulesep
         \pgfpathmoveto { \pgfpoint \l_tmpa_dim \l_tmpb_dim }
-        \pgfpathlineto { \pgfpoint \l_tmpc_dim \l_tmpb_dim }
+        \pgfpathlineto { \pgfpoint \l__nicematrix_tmpc_dim \l_tmpb_dim }
       }
     \CT@arc@
     \pgfsetlinewidth { 1.1 \arrayrulewidth }
@@ -5153,13 +5153,13 @@
     \__nicematrix_qpoint:n { col - \int_use:N \l__nicematrix_local_start_int }
     \dim_set_eq:NN \l_tmpa_dim \pgf@x
     \__nicematrix_qpoint:n { row - \int_use:N \l__nicematrix_position_int }
-    \dim_set_eq:NN \l_tmpb_dim \pgf@y
+    \dim_set:Nn \l_tmpb_dim { \pgf@y - 0.5 \l__nicematrix_rule_width_dim }
     \__nicematrix_qpoint:n { col - \int_eval:n { \l__nicematrix_local_end_int + 1 } }
-    \dim_set_eq:NN \l_tmpc_dim \pgf@x
+    \dim_set_eq:NN \l__nicematrix_tmpc_dim \pgf@x
     \exp_args:NV \tikzset \l__nicematrix_tikz_rule_tl
     \use:x { \exp_not:N \draw [ \l__nicematrix_tikz_rule_tl ] }
       ( \l_tmpa_dim , \l_tmpb_dim ) --
-      ( \l_tmpc_dim , \l_tmpb_dim ) ;
+      ( \l__nicematrix_tmpc_dim , \l_tmpb_dim ) ;
     \end { tikzpicture }
   }
 \cs_new_protected:Npn \__nicematrix_draw_hlines:
@@ -5208,7 +5208,25 @@
 \keys_define:nn { NiceMatrix / ColumnTypes }  { }
 \cs_new_protected:Npn \__nicematrix_custom_line:n #1
   {
+    \str_clear_new:N \l__nicematrix_command_str
+    \str_clear_new:N \l__nicematrix_letter_str
+    \dim_zero_new:N \l__nicematrix_rule_width_dim
+    \tl_clear:N \l_tmpa_tl
+    \bool_set_false:N \l_tmpa_bool
+    \bool_set_false:N \l_tmpb_bool
     \keys_set_known:nn { NiceMatrix / Custom-Line } { #1 }
+    \bool_if:NT \l_tmpa_bool
+      {
+        \cs_if_exist:NF \tikzpicture
+          { \__nicematrix_error:n { tikz~in~custom-line~without~tikz } }
+        \tl_if_empty:NF \l_tmpa_tl
+          { \__nicematrix_error:n { color~in~custom-line~with~tikz } }
+      }
+    \bool_if:NT \l_tmpb_bool
+      {
+        \bool_if:NF \l_tmpa_bool
+          { \__nicematrix_error:n { key~width~without~key~tikz } }
+      }
     \bool_lazy_and:nnTF
       { \str_if_empty_p:N \l__nicematrix_letter_str }
       { \str_if_empty_p:N \l__nicematrix_command_str }
@@ -5232,7 +5250,19 @@
               { \__nicematrix_error:n { Several~letters } }
           }
         \str_if_empty:NF \l__nicematrix_command_str
-          { \exp_args:NnV \__nicematrix_define_h_custom_line:nn { #1 } \l_tmpc_int }
+          {
+            \bool_if:NF \l_tmpa_bool
+              {
+                \dim_set:Nn \l__nicematrix_rule_width_dim
+                  {
+                    \arrayrulewidth * \l__nicematrix_tmpc_int
+                    + \doublerulesep * ( \l__nicematrix_tmpc_int - 1 )
+                  }
+              }
+            \exp_args:NnV \__nicematrix_define_h_custom_line:nn
+              { #1 }
+              \l__nicematrix_rule_width_dim
+          }
       }
   }
 \str_const:Nn \c__nicematrix_forbidden_letters_str { lcrpmbVX:|()[]!@<> }
@@ -5240,13 +5270,17 @@
   {
     letter .str_set:N = \l__nicematrix_letter_str ,
     letter .value_required:n = true ,
-    letter .initial:n = ,
     command .str_set:N = \l__nicematrix_command_str ,
     command .value_required:n = true ,
-    command .initial:n = ,
-    multiplicity .int_set:N = \l_tmpc_int ,
+    multiplicity .int_set:N = \l__nicematrix_tmpc_int ,
     multiplicity .initial:n = 1 ,
     multiplicity .value_required:n = true ,
+    color .tl_set:N = \l_tmpa_tl ,
+    color. value_required:n = true ,
+    tikz .code:n = \bool_set_true:N \l_tmpa_bool ,
+    width .code:n = \dim_set:Nn \l__nicematrix_rule_width_dim { #1 }
+                    \bool_set_true:N \l_tmpb_bool ,
+    width .value_required:n = true ,
   }
 \cs_new_protected:Npn \__nicematrix_define_h_custom_line:nn #1 #2
   {
@@ -5254,11 +5288,7 @@
       {
         \noalign
           {
-            \skip_vertical:n
-              {
-                \dim_eval:n
-                  { \arrayrulewidth * #2 + \doublerulesep * ( #2 - 1) }
-              }
+            \skip_vertical:n { #2 }
             \tl_gput_right:Nx \g__nicematrix_internal_code_after_tl
               { \__nicematrix_hline:n { #1 , position = \int_eval:n { \c@iRow + 1 } } }
           }
@@ -5266,21 +5296,20 @@
   }
 \cs_new_protected:Npn \__nicematrix_custom_line_i:n #1
   {
-    \tl_gput_right:Nx \g__nicematrix_preamble_tl
+    \bool_if:NF \l_tmpa_bool
       {
-        \exp_not:N !
+        \dim_set:Nn \l__nicematrix_rule_width_dim
           {
-            \skip_horizontal:n
-              {
-                \dim_eval:n
-                  {
-                    \arrayrulewidth * \l_tmpc_int
-                    + \doublerulesep * ( \l_tmpc_int - 1)
-                  }
-              }
+            \arrayrulewidth * \l__nicematrix_tmpc_int
+            + \doublerulesep * ( \l__nicematrix_tmpc_int - 1)
           }
       }
-    \tl_gput_right:Nx \g__nicematrix_internal_code_after_tl
+    \tl_gput_right:Nx \g__nicematrix_preamble_tl
+      {
+        \exp_not:N !
+          { \skip_horizontal:n { \dim_use:N \l__nicematrix_rule_width_dim } }
+      }
+     \tl_gput_right:Nx \g__nicematrix_internal_code_after_tl
       { \__nicematrix_vline:n { #1 , position = \__nicematrix_succ:n \c@jCol } }
   }
 \cs_new_protected:Npn \__nicematrix_test_hline_in_block:nnnnn #1 #2 #3 #4
@@ -6116,12 +6145,12 @@
       \__nicematrix_qpoint:n { col - #2 }
       \dim_set_eq:NN \l_tmpb_dim \pgf@x
       \__nicematrix_qpoint:n { row - \__nicematrix_succ:n { \l__nicematrix_last_row_int } }
-      \dim_set_eq:NN \l_tmpc_dim \pgf@y
+      \dim_set_eq:NN \l__nicematrix_tmpc_dim \pgf@y
       \__nicematrix_qpoint:n { col - \__nicematrix_succ:n { \l__nicematrix_last_col_int } }
-      \dim_set_eq:NN \l_tmpd_dim \pgf@x
+      \dim_set_eq:NN \l__nicematrix_tmpd_dim \pgf@x
       \__nicematrix_pgf_rect_node:nnnnn
         { \__nicematrix_env: - #1 - #2 - block }
-        \l_tmpb_dim \l_tmpa_dim \l_tmpd_dim \l_tmpc_dim
+        \l_tmpb_dim \l_tmpa_dim \l__nicematrix_tmpd_dim \l__nicematrix_tmpc_dim
       \str_if_empty:NF \l__nicematrix_block_name_str
         {
           \pgfnodealias
@@ -6154,7 +6183,7 @@
               \__nicematrix_qpoint:n { col - #2 }
               \dim_set_eq:NN \l_tmpb_dim \pgf@x
             }
-          \dim_set:Nn \l_tmpd_dim { - \c_max_dim }
+          \dim_set:Nn \l__nicematrix_tmpd_dim { - \c_max_dim }
           \int_step_inline:nnn \l__nicematrix_first_row_int \g__nicematrix_row_total_int
             {
               \cs_if_exist:cT
@@ -6165,18 +6194,18 @@
                       \pgfpointanchor
                         { \__nicematrix_env: - ##1 - \int_use:N \l__nicematrix_last_col_int }
                         { east }
-                      \dim_set:Nn \l_tmpd_dim { \dim_max:nn \l_tmpd_dim \pgf@x }
+                      \dim_set:Nn \l__nicematrix_tmpd_dim { \dim_max:nn \l__nicematrix_tmpd_dim \pgf@x }
                     }
                 }
             }
-          \dim_compare:nNnT \l_tmpd_dim = { - \c_max_dim }
+          \dim_compare:nNnT \l__nicematrix_tmpd_dim = { - \c_max_dim }
             {
               \__nicematrix_qpoint:n { col - \__nicematrix_succ:n { \l__nicematrix_last_col_int } }
-              \dim_set_eq:NN \l_tmpd_dim \pgf@x
+              \dim_set_eq:NN \l__nicematrix_tmpd_dim \pgf@x
             }
           \__nicematrix_pgf_rect_node:nnnnn
             { \__nicematrix_env: - #1 - #2 - block - short }
-            \l_tmpb_dim \l_tmpa_dim \l_tmpd_dim \l_tmpc_dim
+            \l_tmpb_dim \l_tmpa_dim \l__nicematrix_tmpd_dim \l__nicematrix_tmpc_dim
         }
     \bool_if:NT \l__nicematrix_medium_nodes_bool
       {
@@ -6304,7 +6333,7 @@
         \__nicematrix_qpoint:n { row - \l_tmpa_tl }
         \dim_set:Nn \l_tmpb_dim { \pgf@y }
         \__nicematrix_qpoint:n { col - \l_tmpb_tl }
-        \dim_set:Nn \l_tmpc_dim { \pgf@x }
+        \dim_set:Nn \l__nicematrix_tmpc_dim { \pgf@x }
         \__nicematrix_cut_on_hyphen:w #3 \q_stop
         \int_compare:nNnT \l_tmpa_tl > \c@iRow
           { \tl_set:Nx \l_tmpa_tl { \int_use:N \c@iRow } }
@@ -6313,10 +6342,10 @@
         \__nicematrix_qpoint:n { row - \__nicematrix_succ:n \l_tmpa_tl }
         \dim_set:Nn \l_tmpa_dim { \pgf@y }
         \__nicematrix_qpoint:n { col - \__nicematrix_succ:n \l_tmpb_tl }
-        \dim_set:Nn \l_tmpd_dim { \pgf@x }
+        \dim_set:Nn \l__nicematrix_tmpd_dim { \pgf@x }
         \pgfpathrectanglecorners
-          { \pgfpoint \l_tmpc_dim \l_tmpb_dim }
-          { \pgfpoint \l_tmpd_dim \l_tmpa_dim }
+          { \pgfpoint \l__nicematrix_tmpc_dim \l_tmpb_dim }
+          { \pgfpoint \l__nicematrix_tmpd_dim \l_tmpa_dim }
         \pgfsetlinewidth { 1.1 \l__nicematrix_line_width_dim }
         \pgfusepath { stroke }
       }
@@ -6337,19 +6366,19 @@
     \dim_set_eq:NN \l__nicematrix_line_width_dim \arrayrulewidth
     \keys_set_known:nn { NiceMatrix / BlockBorders } { #1 }
     \__nicematrix_cut_on_hyphen:w #2 \q_stop
-    \tl_set_eq:NN \l_tmpc_tl \l_tmpa_tl
-    \tl_set_eq:NN \l_tmpd_tl \l_tmpb_tl
+    \tl_set_eq:NN \l__nicematrix_tmpc_tl \l_tmpa_tl
+    \tl_set_eq:NN \l__nicematrix_tmpd_tl \l_tmpb_tl
     \__nicematrix_cut_on_hyphen:w #3 \q_stop
     \tl_set:Nx \l_tmpa_tl { \int_eval:n { \l_tmpa_tl + 1 } }
     \tl_set:Nx \l_tmpb_tl { \int_eval:n { \l_tmpb_tl + 1 } }
-    \int_step_inline:nnn \l_tmpd_tl \l_tmpb_tl
+    \int_step_inline:nnn \l__nicematrix_tmpd_tl \l_tmpb_tl
       {
         \use:x
           {
             \__nicematrix_vline:n
               {
                 position = ##1 ,
-                start = \l_tmpc_tl ,
+                start = \l__nicematrix_tmpc_tl ,
                 end = \__nicematrix_pred:n \l_tmpa_tl
               }
           }
@@ -6360,19 +6389,19 @@
     \dim_set_eq:NN \l__nicematrix_line_width_dim \arrayrulewidth
     \keys_set_known:nn { NiceMatrix / BlockBorders } { #1 }
     \__nicematrix_cut_on_hyphen:w #2 \q_stop
-    \tl_set_eq:NN \l_tmpc_tl \l_tmpa_tl
-    \tl_set_eq:NN \l_tmpd_tl \l_tmpb_tl
+    \tl_set_eq:NN \l__nicematrix_tmpc_tl \l_tmpa_tl
+    \tl_set_eq:NN \l__nicematrix_tmpd_tl \l_tmpb_tl
     \__nicematrix_cut_on_hyphen:w #3 \q_stop
     \tl_set:Nx \l_tmpa_tl { \int_eval:n { \l_tmpa_tl + 1 } }
     \tl_set:Nx \l_tmpb_tl { \int_eval:n { \l_tmpb_tl + 1 } }
-    \int_step_inline:nnn \l_tmpc_tl \l_tmpa_tl
+    \int_step_inline:nnn \l__nicematrix_tmpc_tl \l_tmpa_tl
       {
         \use:x
           {
             \__nicematrix_hline:n
               {
                 position = ##1 ,
-                start = \l_tmpd_tl ,
+                start = \l__nicematrix_tmpd_tl ,
                 end = \int_eval:n { \l_tmpb_tl - 1 }
               }
           }
@@ -6391,8 +6420,8 @@
               { \__nicematrix_error:nn { bad~border } { ##1 } }
           }
         \__nicematrix_cut_on_hyphen:w #2 \q_stop
-        \tl_set_eq:NN \l_tmpc_tl \l_tmpa_tl
-        \tl_set_eq:NN \l_tmpd_tl \l_tmpb_tl
+        \tl_set_eq:NN \l__nicematrix_tmpc_tl \l_tmpa_tl
+        \tl_set_eq:NN \l__nicematrix_tmpd_tl \l_tmpb_tl
         \__nicematrix_cut_on_hyphen:w #3 \q_stop
         \tl_set:Nx \l_tmpa_tl { \int_eval:n { \l_tmpa_tl + 1 } }
         \tl_set:Nx \l_tmpb_tl { \int_eval:n { \l_tmpb_tl + 1 } }
@@ -6404,28 +6433,28 @@
         \clist_if_in:NnT \l__nicematrix_borders_clist { right }
           { \__nicematrix_stroke_vertical:n \l_tmpb_tl }
         \clist_if_in:NnT \l__nicematrix_borders_clist { left }
-          { \__nicematrix_stroke_vertical:n \l_tmpd_tl }
+          { \__nicematrix_stroke_vertical:n \l__nicematrix_tmpd_tl }
         \clist_if_in:NnT \l__nicematrix_borders_clist { bottom }
           { \__nicematrix_stroke_horizontal:n \l_tmpa_tl }
         \clist_if_in:NnT \l__nicematrix_borders_clist { top }
-          { \__nicematrix_stroke_horizontal:n \l_tmpc_tl }
+          { \__nicematrix_stroke_horizontal:n \l__nicematrix_tmpc_tl }
         \endpgfpicture
      }
   }
 \cs_new_protected:Npn \__nicematrix_stroke_vertical:n #1
   {
-    \__nicematrix_qpoint:n \l_tmpc_tl
+    \__nicematrix_qpoint:n \l__nicematrix_tmpc_tl
     \dim_set:Nn \l_tmpb_dim { \pgf@y + 0.5 \l__nicematrix_line_width_dim }
     \__nicematrix_qpoint:n \l_tmpa_tl
-    \dim_set:Nn \l_tmpc_dim { \pgf@y + 0.5 \l__nicematrix_line_width_dim }
+    \dim_set:Nn \l__nicematrix_tmpc_dim { \pgf@y + 0.5 \l__nicematrix_line_width_dim }
     \__nicematrix_qpoint:n { #1 }
     \pgfpathmoveto { \pgfpoint \pgf@x \l_tmpb_dim }
-    \pgfpathlineto { \pgfpoint \pgf@x \l_tmpc_dim }
+    \pgfpathlineto { \pgfpoint \pgf@x \l__nicematrix_tmpc_dim }
     \pgfusepathqstroke
   }
 \cs_new_protected:Npn \__nicematrix_stroke_horizontal:n #1
   {
-    \__nicematrix_qpoint:n \l_tmpd_tl
+    \__nicematrix_qpoint:n \l__nicematrix_tmpd_tl
     \clist_if_in:NnTF \l__nicematrix_borders_clist { left }
       { \dim_set:Nn \l_tmpa_dim { \pgf@x - 0.5 \l__nicematrix_line_width_dim } }
       { \dim_set:Nn \l_tmpa_dim { \pgf@x + 0.5 \l__nicematrix_line_width_dim } }
@@ -6581,10 +6610,10 @@
     \dim_set_eq:NN \l_tmpb_dim \pgf@x
     \pgfpathmoveto { \pgfpoint \l_tmpb_dim \l_tmpa_dim }
     \__nicematrix_qpoint:n { row - \__nicematrix_succ:n { #3 } }
-    \dim_set_eq:NN \l_tmpc_dim \pgf@y
+    \dim_set_eq:NN \l__nicematrix_tmpc_dim \pgf@y
     \__nicematrix_qpoint:n { col - \__nicematrix_succ:n { #4 } }
-    \dim_set_eq:NN \l_tmpd_dim \pgf@x
-    \pgfpathlineto { \pgfpoint \l_tmpd_dim \l_tmpc_dim }
+    \dim_set_eq:NN \l__nicematrix_tmpd_dim \pgf@x
+    \pgfpathlineto { \pgfpoint \l__nicematrix_tmpd_dim \l__nicematrix_tmpc_dim }
     {
        \CT@arc@
        \pgfsetroundcap
@@ -6592,7 +6621,7 @@
     }
     \pgfset { inner~sep = 1 pt }
     \pgfscope
-    \pgftransformshift { \pgfpoint \l_tmpb_dim \l_tmpc_dim }
+    \pgftransformshift { \pgfpoint \l_tmpb_dim \l__nicematrix_tmpc_dim }
     \pgfnode { rectangle } { south~west }
       {
         \begin { minipage } { 20 cm }
@@ -6602,7 +6631,7 @@
       { }
       { }
     \endpgfscope
-    \pgftransformshift { \pgfpoint \l_tmpd_dim \l_tmpa_dim }
+    \pgftransformshift { \pgfpoint \l__nicematrix_tmpd_dim \l_tmpa_dim }
     \pgfnode { rectangle } { north~east }
       {
         \begin { minipage } { 20 cm }
@@ -6767,18 +6796,18 @@
     \peek_remove_spaces:n
       {
         \__nicematrix_cut_on_hyphen:w #3 \q_stop
-        \tl_clear_new:N \l_tmpc_tl
-        \tl_clear_new:N \l_tmpd_tl
-        \tl_set_eq:NN \l_tmpc_tl \l_tmpa_tl
-        \tl_set_eq:NN \l_tmpd_tl \l_tmpb_tl
+        \tl_clear_new:N \l__nicematrix_tmpc_tl
+        \tl_clear_new:N \l__nicematrix_tmpd_tl
+        \tl_set_eq:NN \l__nicematrix_tmpc_tl \l_tmpa_tl
+        \tl_set_eq:NN \l__nicematrix_tmpd_tl \l_tmpb_tl
         \__nicematrix_cut_on_hyphen:w #2 \q_stop
         \seq_gput_right:Nx \g__nicematrix_submatrix_seq
-          { { \l_tmpa_tl } { \l_tmpb_tl } { \l_tmpc_tl } { \l_tmpd_tl } }
+          { { \l_tmpa_tl } { \l_tmpb_tl } { \l__nicematrix_tmpc_tl } { \l__nicematrix_tmpd_tl } }
         \tl_gput_right:Nn \g__nicematrix_internal_code_after_tl
           { \SubMatrix { #1 } { #2 } { #3 } { #4 } [ #5 ] }
       }
   }
-\AtBeginDocument
+\hook_gput_code:nnn { begindocument } { . }
   {
     \tl_set:Nn \l__nicematrix_argspec_tl { m m m m O { } E { _ ^ } { { } { } } }
     \tl_set_rescan:Nno  \l__nicematrix_argspec_tl { } \l__nicematrix_argspec_tl
@@ -7255,12 +7284,6 @@
     renew-dots,~and
     renew-matrix.
   }
-\__nicematrix_msg_new:nn { Key~transparent }
-  {
-    The~key~'transparent'~is~now~obsolete~(because~it's~name~
-    is~not~clear).~You~must~use~the~conjonction~of~'renew-dots'~
-    and~'renew-matrix'.~This~error~is~fatal.
-  }
 \keys_define:nn { NiceMatrix / Package }
   {
     renew-dots .bool_set:N = \l__nicematrix_renew_dots_bool ,
@@ -7495,6 +7518,11 @@
     You~can't~use~the~letter~'\l__nicematrix_letter_str'~for~a~customized~line.\\
     If~you~go~on,~it~will~be~ignored.
   }
+\__nicematrix_msg_new:nn { key~width~without~key~tikz }
+  {
+    In~'custom-line',~you~have~used~'width'~without~'tikz'.~That's~not~correct.~
+    If~you~go~on,~that~key~'width'~will~be~discarded.
+  }
 \__nicematrix_msg_new:nn { Several~letters }
   {
     You~must~use~only~one~letter~as~value~for~the~key~'letter'~(and~
@@ -7625,6 +7653,19 @@
     ~because~you~haven't~loaded~'enumitem'.\\
     If~you~go~on,~this~command~will~be~ignored.
   }
+\__nicematrix_msg_new:nn { tikz~in~custom-line~without~tikz }
+  {
+    You~have~used~the~key~'tikz'~in~the~definition~of~a~
+    customized~line~(with~'custom-line')~but~Tikz~is~not~loaded.~
+    You~can~go~on~but~you~will~have~another~error~if~you~actually~
+    use~that~custom~line.
+  }
+\__nicematrix_msg_new:nn { color~in~custom-line~with~tikz }
+  {
+    In~a~'custom-line',~you~have~used~both~'tikz'~and~'color',~
+    which~is~forbidden~(you~should~use~'color'~inside~the~key~'tikz').~
+    If~you~go~on,~the~key~'color'~will~be~discarded.
+  }
 \__nicematrix_msg_new:nn { Wrong~last~row }
   {
     You~have~used~'last-row=\int_use:N \l__nicematrix_last_row_int'~but~your~
-- 
cgit v1.2.3