nicematrix (25jun22)

git-svn-id: svn://tug.org/texlive/trunk@63723 c570f23f-e606-0410-a88d-b1316a301751

1 files changed, 437 insertions, 318 deletions

diff --git a/Master/texmf-dist/tex/latex/nicematrix/nicematrix.sty b/Master/texmf-dist/tex/latex/nicematrix/nicematrix.sty
index e2cf4c609d8..d23bb1774ef 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{6.9}
-\def\myfiledate{2022/05/25}
+\def\myfileversion{6.10}
+\def\myfiledate{2022/06/25}
 \RequirePackage{pgfcore}
 \usepgfmodule{shapes}
 \RequirePackage{l3keys2e}
@@ -37,7 +37,13 @@
 \cs_new_protected:Npn \__nicematrix_fatal:n { \msg_fatal:nn { nicematrix } }
 \cs_new_protected:Npn \__nicematrix_fatal:nn { \msg_fatal:nnn { nicematrix } }
 \cs_new_protected:Npn \__nicematrix_msg_new:nn { \msg_new:nnn { nicematrix } }
-\cs_new_protected:Npn \__nicematrix_msg_new:nnn { \msg_new:nnnn { nicematrix } }
+\cs_new_protected:Npn \__nicematrix_msg_new:nnn #1 #2 #3
+  {
+    \bool_if:NTF \c__nicematrix_messages_for_Overleaf_bool
+      { \msg_new:nnn { nicematrix } { #1 } { #2 \\ #3 } }
+      { \msg_new:nnnn { nicematrix } { #1 } { #2 } { #3 } }
+  }
+
 \cs_new_protected:Npn \__nicematrix_msg_redirect_name:nn
   { \msg_redirect_name:nnn { nicematrix } }
 \tl_new:N \l__nicematrix_argspec_tl
@@ -248,6 +254,7 @@
 \dim_set:Nn \l__nicematrix_col_width_dim { -1 cm }
 \int_new:N \g__nicematrix_row_total_int
 \int_new:N \g__nicematrix_col_total_int
+\int_new:N \g__nicematrix_last_row_node_int
 \int_new:N \l__nicematrix_key_nb_rows_int
 \str_new:N \l__nicematrix_hpos_cell_str
 \str_set:Nn \l__nicematrix_hpos_cell_str { c }
@@ -262,6 +269,7 @@
 \bool_new:N \l__nicematrix_NiceArray_bool
 \bool_new:N \l__nicematrix_NiceTabular_bool
 \dim_new:N \l__nicematrix_tabular_width_dim
+\dim_new:N \l__nicematrix_rule_width_dim
 \bool_new:N \l__nicematrix_Matrix_bool
 \bool_new:N \g__nicematrix_rotate_bool
 \bool_new:N \l__nicematrix_X_column_bool
@@ -526,9 +534,13 @@
 \dim_new:N \l__nicematrix_xdots_inter_dim
 \hook_gput_code:nnn { begindocument } { . }
   { \dim_set:Nn \l__nicematrix_xdots_inter_dim { 0.45 em } }
-\dim_new:N \l__nicematrix_xdots_shorten_dim
+\dim_new:N \l__nicematrix_xdots_shorten_start_dim
+\dim_new:N \l__nicematrix_xdots_shorten_end_dim
 \hook_gput_code:nnn { begindocument } { . }
-  { \dim_set:Nn \l__nicematrix_xdots_shorten_dim { 0.3 em } }
+  {
+    \dim_set:Nn \l__nicematrix_xdots_shorten_start_dim { 0.3 em }
+    \dim_set:Nn \l__nicematrix_xdots_shorten_end_dim { 0.3 em }
+  }
 \dim_new:N \l__nicematrix_xdots_radius_dim
 \hook_gput_code:nnn { begindocument } { . }
   { \dim_set:Nn \l__nicematrix_xdots_radius_dim { 0.53 pt } }
@@ -577,8 +589,19 @@
     color .value_required:n = true ,
     shorten .code:n =
       \hook_gput_code:nnn { begindocument } { . }
-        { \dim_set:Nn \l__nicematrix_xdots_shorten_dim { #1 } } ,
+        {
+          \dim_set:Nn \l__nicematrix_xdots_shorten_start_dim { #1 }
+          \dim_set:Nn \l__nicematrix_xdots_shorten_end_dim { #1 }
+        } ,
+    shorten-start .code:n =
+      \hook_gput_code:nnn { begindocument } { . }
+        { \dim_set:Nn \l__nicematrix_xdots_shorten_start_dim { #1 } } ,
+    shorten-end .code:n =
+      \hook_gput_code:nnn { begindocument } { . }
+        { \dim_set:Nn \l__nicematrix_xdots_shorten_end_dim { #1 } } ,
     shorten .value_required:n = true ,
+    shorten-start .value_required:n = true ,
+    shorten-end .value_required:n = true ,
     radius .code:n =
       \hook_gput_code:nnn { begindocument } { . }
         { \dim_set:Nn \l__nicematrix_xdots_radius_dim { #1 } } ,
@@ -681,17 +704,7 @@
   }
 \keys_define:nn { NiceMatrix / Env }
   {
-    hvlines-except-corners .code:n =
-      {
-        \__nicematrix_error:n { hvlines-except-corners }
-        \group_begin:
-        \globaldefs = 1
-        \__nicematrix_msg_redirect_name:nn { hvlines-except-corners } { none }
-        \group_end:
-        \clist_set:Nn \l__nicematrix_corners_clist { #1 }
-        \clist_set:Nn \l__nicematrix_vlines_clist { all }
-        \clist_set:Nn \l__nicematrix_hlines_clist { all }
-      } ,
+    hvlines-except-corners .code:n = \__nicematrix_fatal:n { hvlines-except-corners } ,
     hvlines-except-corners .default:n = { NW , SW , NE , SE } ,
     corners .clist_set:N = \l__nicematrix_corners_clist ,
     corners .default:n = { NW , SW , NE , SE } ,
@@ -840,18 +853,6 @@
     allow-duplicate-names .code:n =
       \__nicematrix_msg_redirect_name:nn { Duplicate~name } { none } ,
     allow-duplicate-names .value_forbidden:n = true ,
-    letter-for-dotted-lines .code:n =
-      {
-        \__nicematrix_error:n { letter-for-dotted-lines }
-        \group_begin:
-        \globaldefs = 1
-        \__nicematrix_msg_redirect_name:nn { letter-for-dotted-lines } { none }
-        \group_end:
-        \tl_if_single_token:nTF { #1 }
-          { \str_set:Nx \l__nicematrix_letter_for_dotted_lines_str { #1 } }
-          { \__nicematrix_error:n { One~letter~allowed } }
-      } ,
-    letter-for-dotted-lines .value_required:n = true ,
     notes .code:n = \keys_set:nn { NiceMatrix / notes } { #1 } ,
     notes .value_required:n = true ,
     sub-matrix .code:n =
@@ -859,7 +860,6 @@
     sub-matrix .value_required:n = true ,
     unknown .code:n  = \__nicematrix_error:n { Unknown~key~for~NiceMatrixOptions }
   }
-\str_new:N \l__nicematrix_letter_for_dotted_lines_str
 \NewDocumentCommand \NiceMatrixOptions { m }
   { \keys_set:nn { NiceMatrix / NiceMatrixOptions } { #1 } }
 \keys_define:nn { NiceMatrix / NiceMatrix }
@@ -1132,6 +1132,14 @@
 \cs_set_eq:NN \__nicematrix_old_ialign: \ialign
 \cs_new_protected:Npn \__nicematrix_create_row_node:
   {
+    \int_compare:nNnT \c@iRow > \g__nicematrix_last_row_node_int
+      {
+        \int_gset_eq:NN \g__nicematrix_last_row_node_int \c@iRow
+        \__nicematrix_create_row_node_i:
+      }
+  }
+\cs_new_protected:Npn \__nicematrix_create_row_node_i:
+  {
     \hbox
       {
         \bool_if:NT \l__nicematrix_code_before_bool
@@ -1337,6 +1345,7 @@
     \seq_gclear:N \g__nicematrix_pos_of_blocks_seq
     \seq_gclear_new:N \g__nicematrix_multicolumn_cells_seq
     \seq_gclear_new:N \g__nicematrix_multicolumn_sizes_seq
+    \int_gset:Nn \g__nicematrix_last_row_node_int { -1 }
     \__nicematrix_pre_array_ii:
     \box_clear_new:N \l__nicematrix_the_array_box
     \__nicematrix_construct_preamble:
@@ -1361,7 +1370,7 @@
       { \use:c { __nicematrix-light-syntax } }
       { \use:c { __nicematrix-normal-syntax } }
   }
-\cs_new_protected:Npn \__nicematrix_pre_array_i:w #1 \Body
+\cs_new_protected_nopar:Npn \__nicematrix_CodeBefore_Body:w #1 \Body
   {
     \tl_put_right:Nn \l__nicematrix_code_before_tl { #1 }
     \bool_set_true:N \l__nicematrix_code_before_bool
@@ -1588,7 +1597,7 @@
     { #3 , #5 }
     \tl_if_empty:NF \l__nicematrix_rules_color_tl
       { \exp_after:wN \__nicematrix_set_CT@arc@: \l__nicematrix_rules_color_tl \q_stop }
-    \IfBooleanTF { #6 } \__nicematrix_pre_array_i:w \__nicematrix_pre_array:
+    \IfBooleanTF { #6 } \__nicematrix_CodeBefore_Body:w \__nicematrix_pre_array:
   }
   {
     \bool_if:NTF \l__nicematrix_light_syntax_bool
@@ -1839,23 +1848,20 @@
         \q_stop { }
       }
       {
-        \str_case_e:nnF { #1 }
+        \str_if_eq:nVTF { #1 } \l__nicematrix_letter_vlism_tl
+          {
+            \seq_gput_right:Nx \g__nicematrix_cols_vlism_seq
+              { \int_eval:n { \c@jCol + 1 } }
+            \tl_gput_right:Nx \g__nicematrix_preamble_tl
+              { \exp_not:N ! { \skip_horizontal:N \arrayrulewidth } }
+            \__nicematrix_patch_preamble:n
+          }
           {
-            \l__nicematrix_letter_for_dotted_lines_str
-              { \__nicematrix_patch_preamble_xii:n #1 }
-            \l__nicematrix_letter_vlism_tl
+            \keys_if_exist:nnTF { NiceMatrix / ColumnTypes } { #1 }
               {
-                \seq_gput_right:Nx \g__nicematrix_cols_vlism_seq
-                  { \int_eval:n { \c@jCol + 1 } }
-                \tl_gput_right:Nx \g__nicematrix_preamble_tl
-                  { \exp_not:N ! { \skip_horizontal:N \arrayrulewidth } }
+                \keys_set:nn { NiceMatrix / ColumnTypes } { #1 }
                 \__nicematrix_patch_preamble:n
               }
-          }
-          {
-            \keys_set_known:nnN { NiceMatrix / ColumnTypes } { #1 } \l_tmpa_tl
-            \tl_if_empty:NTF \l_tmpa_tl
-              \__nicematrix_patch_preamble:n
               { \__nicematrix_fatal:nn { unknown~column~type } { #1 } }
           }
       }
@@ -2238,14 +2244,6 @@
         \__nicematrix_patch_preamble_xi:n
       }
   }
-\cs_new_protected:Npn \__nicematrix_patch_preamble_xii:n #1
-  {
-    \tl_gput_right:Nn \g__nicematrix_preamble_tl
-      { ! { \skip_horizontal:N 2\l__nicematrix_xdots_radius_dim } }
-    \tl_gput_right:Nx \g__nicematrix_internal_code_after_tl
-      { \__nicematrix_vdottedline:n { \int_use:N \c@jCol } }
-    \__nicematrix_patch_preamble:n
-  }
 \cs_new_protected:Npn \__nicematrix_patch_preamble_xi:n #1
   {
     \str_if_eq:nnTF { #1 } { < }
@@ -2487,7 +2485,7 @@
         \seq_if_empty:NF \g__nicematrix_blocks_seq \__nicematrix_draw_blocks:
       }
     \bool_lazy_or:nnT
-      { \int_compare_p:nNn \c@tabularnote > 0 }
+      { ! \seq_if_empty_p:N \g__nicematrix_tabularnotes_seq }
       { ! \tl_if_empty_p:V \l__nicematrix_tabularnote_tl }
       \__nicematrix_insert_tabularnotes:
     \end { minipage }
@@ -3148,7 +3146,10 @@
       {
         \dim_set:Nn \l__nicematrix_xdots_radius_dim { 0.7 \l__nicematrix_xdots_radius_dim }
         \dim_set:Nn \l__nicematrix_xdots_inter_dim { 0.55 \l__nicematrix_xdots_inter_dim }
-        \dim_set:Nn \l__nicematrix_xdots_shorten_dim { 0.6 \l__nicematrix_xdots_shorten_dim }
+        \dim_set:Nn \l__nicematrix_xdots_shorten_start_dim
+          { 0.6 \l__nicematrix_xdots_shorten_start_dim }
+        \dim_set:Nn \l__nicematrix_xdots_shorten_end_dim
+          { 0.6 \l__nicematrix_xdots_shorten_end_dim }
       }
     \__nicematrix_draw_dotted_lines:
     \__nicematrix_compute_corners:
@@ -3868,8 +3869,8 @@
     \draw
       [
         #1 ,
-        shorten~> = \l__nicematrix_xdots_shorten_dim ,
-        shorten~< = \l__nicematrix_xdots_shorten_dim ,
+        shorten~> = \l__nicematrix_xdots_shorten_end_dim ,
+        shorten~< = \l__nicematrix_xdots_shorten_start_dim ,
       ]
           ( \l__nicematrix_x_initial_dim , \l__nicematrix_y_initial_dim )
        -- node [ sloped , above ] { $ \scriptstyle #2 $ }
@@ -3958,7 +3959,7 @@
             \int_set:Nn \l_tmpa_int
               {
                 \dim_ratio:nn
-                  { \l__nicematrix_l_dim - \l__nicematrix_xdots_shorten_dim }
+                  { \l__nicematrix_l_dim - \l__nicematrix_xdots_shorten_start_dim }
                   \l__nicematrix_xdots_inter_dim
               }
           }
@@ -3969,7 +3970,7 @@
             \int_set:Nn \l_tmpa_int
               {
                 \dim_ratio:nn
-                  { \l__nicematrix_l_dim - \l__nicematrix_xdots_shorten_dim }
+                  { \l__nicematrix_l_dim - \l__nicematrix_xdots_shorten_end_dim }
                   \l__nicematrix_xdots_inter_dim
               }
           }
@@ -3977,7 +3978,10 @@
             \int_set:Nn \l_tmpa_int
               {
                 \dim_ratio:nn
-                  { \l__nicematrix_l_dim - 2 \l__nicematrix_xdots_shorten_dim  }
+                  {
+                    \l__nicematrix_l_dim
+                    - \l__nicematrix_xdots_shorten_start_dim - \l__nicematrix_xdots_shorten_end_dim
+                  }
                   \l__nicematrix_xdots_inter_dim
               }
           }
@@ -3992,27 +3996,25 @@
         ( \l__nicematrix_y_final_dim - \l__nicematrix_y_initial_dim ) *
         \dim_ratio:nn \l__nicematrix_xdots_inter_dim \l__nicematrix_l_dim
       }
-    \int_set:Nn \l_tmpb_int
-      {
-        \bool_if:NTF \l__nicematrix_initial_open_bool
-          { \bool_if:NTF \l__nicematrix_final_open_bool 1 0 }
-          { \bool_if:NTF \l__nicematrix_final_open_bool 2 1 }
-      }
     \dim_gadd:Nn \l__nicematrix_x_initial_dim
       {
         ( \l__nicematrix_x_final_dim - \l__nicematrix_x_initial_dim ) *
         \dim_ratio:nn
-          { \l__nicematrix_l_dim - \l__nicematrix_xdots_inter_dim * \l_tmpa_int }
+          {
+            \l__nicematrix_l_dim - \l__nicematrix_xdots_inter_dim * \l_tmpa_int
+            + \l__nicematrix_xdots_shorten_start_dim - \l__nicematrix_xdots_shorten_end_dim
+          }
           { 2 \l__nicematrix_l_dim }
-        * \l_tmpb_int
       }
     \dim_gadd:Nn \l__nicematrix_y_initial_dim
       {
         ( \l__nicematrix_y_final_dim - \l__nicematrix_y_initial_dim ) *
         \dim_ratio:nn
-          { \l__nicematrix_l_dim - \l__nicematrix_xdots_inter_dim * \l_tmpa_int }
+          {
+            \l__nicematrix_l_dim - \l__nicematrix_xdots_inter_dim * \l_tmpa_int
+            + \l__nicematrix_xdots_shorten_start_dim - \l__nicematrix_xdots_shorten_end_dim
+          }
           { 2 \l__nicematrix_l_dim }
-        * \l_tmpb_int
       }
     \pgf@relevantforpicturesizefalse
     \int_step_inline:nnn 0 \l_tmpa_int
@@ -4309,6 +4311,12 @@
   }
 \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
+  {
+    \tl_if_empty:nTF { #2 }
+      { #1 }
+      { \__nicematrix_double_int_eval_i:n #1-#2 \q_stop }
+  }
+\cs_new:Npn \__nicematrix_double_int_eval_i:n #1-#2- \q_stop
   { \int_eval:n { #1 } - \int_eval:n { #2 } }
 \hook_gput_code:nnn { begindocument } { . }
   {
@@ -4322,8 +4330,8 @@
           \use:e
             {
               \__nicematrix_line_i:nn
-                { \__nicematrix_double_int_eval:n #2 \q_stop }
-                { \__nicematrix_double_int_eval:n #3 \q_stop }
+                { \__nicematrix_double_int_eval:n #2 - \q_stop }
+                { \__nicematrix_double_int_eval:n #3 - \q_stop }
             }
         \group_end:
       }
@@ -4820,8 +4828,6 @@
     start .int_set:N = \l__nicematrix_start_int ,
     start .initial:n = 1 ,
     end .int_set:N = \l__nicematrix_end_int ,
-    % letter .code:n = \prg_do_nothing: ,
-    % command .code:n = \prg_do_nothing:
   }
 \keys_define:nn { NiceMatrix / RulesBis }
   {
@@ -4837,8 +4843,9 @@
     tikz .tl_set:N = \l__nicematrix_tikz_rule_tl ,
     tikz .value_required:n = true ,
     tikz .initial:n = ,
-    width .dim_set:N = \l__nicematrix_rule_width_dim ,
-    width .value_required:n = true
+    total-width .dim_set:N = \l__nicematrix_rule_width_dim ,
+    total-width .value_required:n = true ,
+    width .meta:n = { total-width = #1 }
   }
 \cs_new_protected:Npn \__nicematrix_vline:n #1
   {
@@ -4913,8 +4920,8 @@
    }
 \cs_new_protected:Npn \__nicematrix_vline_ii:
   {
-    \bool_set_false:N \l__nicematrix_dotted_boo
-    \keys_set_known:nV { NiceMatrix / RulesBis } \l__nicematrix_other_keys_tl
+    \bool_set_false:N \l__nicematrix_dotted_bool
+    \keys_set:nV { NiceMatrix / RulesBis } \l__nicematrix_other_keys_tl
     \bool_if:NTF \l__nicematrix_dotted_bool
       \__nicematrix_vline_iv:
       {
@@ -4931,7 +4938,14 @@
     \__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
+        +
+        ( \arrayrulewidth * \l__nicematrix_multiplicity_int
+           + \doublerulesep * ( \l__nicematrix_multiplicity_int - 1 ) ) / 2
+      }
     \__nicematrix_qpoint:n { row - \int_eval:n { \l__nicematrix_local_end_int + 1 } }
     \dim_set_eq:NN \l__nicematrix_tmpc_dim \pgf@y
     \bool_lazy_all:nT
@@ -4977,8 +4991,8 @@
     \pgfrememberpicturepositiononpagetrue
     \pgf@relevantforpicturesizefalse
     \__nicematrix_qpoint:n { col - \int_use:N \l__nicematrix_position_int }
-    \dim_set_eq:NN \l__nicematrix_x_initial_dim \pgf@x
-    \dim_set_eq:NN \l__nicematrix_x_final_dim \pgf@x
+    \dim_set:Nn \l__nicematrix_x_initial_dim { \pgf@x - 0.5 \l__nicematrix_rule_width_dim }
+    \dim_set_eq:NN \l__nicematrix_x_final_dim \l__nicematrix_x_initial_dim
     \__nicematrix_qpoint:n { row - \int_use:N \l__nicematrix_local_start_int }
     \dim_set_eq:NN \l__nicematrix_y_initial_dim \pgf@y
     \__nicematrix_qpoint:n { row - \int_eval:n { \l__nicematrix_local_end_int + 1 } }
@@ -5019,7 +5033,7 @@
       {
         \tl_if_eq:NnF \l__nicematrix_vlines_clist { all }
           { \clist_if_in:NnT \l__nicematrix_vlines_clist { ##1 } }
-          { \__nicematrix_vline:n { position = ##1 } }
+          { \__nicematrix_vline:n { position = ##1 , total-width = \arrayrulewidth } }
       }
   }
 \cs_new_protected:Npn \__nicematrix_hline:n #1
@@ -5095,7 +5109,7 @@
 \cs_new_protected:Npn \__nicematrix_hline_ii:
   {
     \bool_set_false:N \l__nicematrix_dotted_bool
-    \keys_set_known:nV { NiceMatrix / RulesBis } \l__nicematrix_other_keys_tl
+    \keys_set:nV { NiceMatrix / RulesBis } \l__nicematrix_other_keys_tl
     \bool_if:NTF \l__nicematrix_dotted_bool
       \__nicematrix_hline_iv:
       {
@@ -5112,7 +5126,14 @@
     \__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
+        +
+        ( \arrayrulewidth * \l__nicematrix_multiplicity_int
+           + \doublerulesep * ( \l__nicematrix_multiplicity_int - 1 ) ) / 2
+      }
     \__nicematrix_qpoint:n { col - \int_eval:n { \l__nicematrix_local_end_int + 1 } }
     \dim_set_eq:NN \l__nicematrix_tmpc_dim \pgf@x
     \bool_lazy_all:nT
@@ -5156,8 +5177,8 @@
     \pgfrememberpicturepositiononpagetrue
     \pgf@relevantforpicturesizefalse
     \__nicematrix_qpoint:n { row - \int_use:N \l__nicematrix_position_int }
-    \dim_set_eq:NN \l__nicematrix_y_initial_dim \pgf@y
-    \dim_set_eq:NN \l__nicematrix_y_final_dim \pgf@y
+    \dim_set:Nn \l__nicematrix_y_initial_dim { \pgf@y - 0.5 \l__nicematrix_rule_width_dim }
+    \dim_set_eq:NN \l__nicematrix_y_final_dim \l__nicematrix_y_initial_dim
     \__nicematrix_qpoint:n { col - \int_use:N \l__nicematrix_local_start_int }
     \dim_set_eq:NN \l__nicematrix_x_initial_dim \pgf@x
     \int_compare:nNnT \l__nicematrix_local_start_int = 1
@@ -5214,7 +5235,7 @@
       {
         \tl_if_eq:NnF \l__nicematrix_hlines_clist { all }
           { \clist_if_in:NnT \l__nicematrix_hlines_clist { ##1 } }
-          { \__nicematrix_hline:n { position = ##1 } }
+          { \__nicematrix_hline:n { position = ##1 , total-width = \arrayrulewidth } }
       }
   }
 \cs_set:Npn \__nicematrix_Hline: { \noalign { \ifnum 0 = `} \fi \__nicematrix_Hline_i:n { 1 } }
@@ -5250,113 +5271,156 @@
   {
     \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
+    \keys_set_known:nnN { NiceMatrix / custom-line } { #1 } \l__nicematrix_other_keys_tl
+    \bool_lazy_and:nnTF
+      { \str_if_empty_p:N \l__nicematrix_letter_str }
+      { \str_if_empty_p:N \l__nicematrix_command_str }
+      { \__nicematrix_error:n { No~letter~and~no~command } }
+      { \exp_args:NV \__nicematrix_custom_line_i:n \l__nicematrix_other_keys_tl }
+  }
+\keys_define:nn { NiceMatrix / custom-line }
+  {
+    % here, we will use change in the future to use .str_set:N
+    letter .code:n = \str_set:Nn \l__nicematrix_letter_str { #1 } ,
+    letter .value_required:n = true ,
+    % here, we will use change in the future to use .str_set:N
+    command .code:n = \str_set:Nn \l__nicematrix_command_str { #1 } ,
+    command .value_required:n = true ,
+  }
+\cs_new_protected:Npn \__nicematrix_custom_line_i:n #1
+  {
+    \bool_set_false:N \l__nicematrix_tikz_rule_bool
+    \bool_set_false:N \l__nicematrix_dotted_rule_bool
+    \bool_set_false:N \l__nicematrix_color_bool
+    \keys_set:nn { NiceMatrix / custom-line-bis } { #1 }
+    \bool_if:NT \l__nicematrix_tikz_rule_bool
       {
         \cs_if_exist:NF \tikzpicture
           { \__nicematrix_error:n { tikz~in~custom-line~without~tikz } }
-        \tl_if_empty:NF \l_tmpa_tl
+        \bool_if:NT \l__nicematrix_color_bool
           { \__nicematrix_error:n { color~in~custom-line~with~tikz } }
       }
-    \bool_if:NT \l_tmpb_bool
+    \bool_if:nT
       {
-        \bool_if:NF \l_tmpa_bool
-          { \__nicematrix_error:n { key~width~without~key~tikz } }
+        \int_compare_p:nNn \l__nicematrix_multiplicity_int > 1
+        && \l__nicematrix_dotted_rule_bool
       }
-    \bool_lazy_and:nnTF
-      { \str_if_empty_p:N \l__nicematrix_letter_str }
-      { \str_if_empty_p:N \l__nicematrix_command_str }
-      { \__nicematrix_error:n { No~letter~and~no~command } }
+      { \__nicematrix_error:n { key~multiplicity~with~dotted } }
+    \str_if_empty:NF \l__nicematrix_letter_str
       {
-        \str_if_empty:NF \l__nicematrix_letter_str
+        \int_compare:nTF { \str_count:N \l__nicematrix_letter_str != 1 }
+          { \__nicematrix_error:n { Several~letters } }
           {
-            \int_compare:nNnTF { \str_count:N \l__nicematrix_letter_str } = 1
+            \exp_args:NnV \tl_if_in:NnTF
+              \c__nicematrix_forbidden_letters_str \l__nicematrix_letter_str
+              { \__nicematrix_error:n { Forbidden~letter } }
               {
-                \exp_args:NnV \tl_if_in:NnTF
-                  \c__nicematrix_forbidden_letters_str \l__nicematrix_letter_str
-                  { \__nicematrix_error:n { Forbidden~letter } }
-                  {
-                    \keys_define:nx { NiceMatrix / ColumnTypes }
-                      {
-                        \l__nicematrix_letter_str .code:n =
-                          { \__nicematrix_custom_line_i:n { \exp_not:n { #1 } } }
-                      }
-                  }
-              }
-              { \__nicematrix_error:n { Several~letters } }
-          }
-        \str_if_empty:NF \l__nicematrix_command_str
-          {
-            \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 )
-                  }
-              }
-            \__nicematrix_define_h_custom_line:nV { #1 } \l__nicematrix_rule_width_dim
-          }
-      }
+                 \keys_define:nx { NiceMatrix / ColumnTypes }
+                   {
+                     \l__nicematrix_letter_str .code:n =
+                       { \__nicematrix_v_custom_line:n { \exp_not:n { #1 }  } }
+                   }
+               }
+           }
+       }
+    \str_if_empty:NF \l__nicematrix_command_str { \__nicematrix_h_custom_line:n { #1 } }
   }
 \str_const:Nn \c__nicematrix_forbidden_letters_str { lcrpmbVX|()[]!@<> }
-\keys_define:nn { NiceMatrix / Custom-Line }
+\keys_define:nn { NiceMatrix / custom-line-bis }
   {
-    % here, we will use change in the future to use .tl_set:N
-    letter .code:n = \str_set:Nn \l__nicematrix_letter_str { #1 } ,
-    letter .value_required:n = true ,
-    % here, we will use change in the future to use .tl_set:N
-    command .code:n = \str_set:Nn \l__nicematrix_command_str { #1 } ,
-    command .value_required:n = true ,
-    multiplicity .int_set:N = \l__nicematrix_tmpc_int ,
+    multiplicity .int_set:N = \l__nicematrix_multiplicity_int ,
     multiplicity .initial:n = 1 ,
     multiplicity .value_required:n = true ,
-    color .tl_set:N = \l_tmpa_tl ,
+    color .code:n = \bool_set_true:N \l__nicematrix_color_bool ,
     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 ,
+    tikz .code:n = \bool_set_true:N \l__nicematrix_tikz_rule_bool ,
+    tikz .value_required:n = true ,
+    dotted .code:n = \bool_set_true:N \l__nicematrix_dotted_rule_bool ,
+    dotted .value_forbidden:n = true ,
+    total-width .code:n = { } ,
+    total-width .value_required:n = true ,
+    width .code:n = { } ,
     width .value_required:n = true ,
+    sep-color .code:n = { } ,
+    sep-color .value_required:n = true ,
     unknown .code:n = \__nicematrix_error:n { Unknown~key~for~custom-line }
   }
-\cs_new_protected:Npn \__nicematrix_define_h_custom_line:nn #1 #2
+\bool_new:N \l__nicematrix_dotted_rule_bool
+\bool_new:N \l__nicematrix_tikz_rule_bool
+\bool_new:N \l__nicematrix_color_bool
+\keys_define:nn { NiceMatrix / custom-line-width }
+  {
+    multiplicity .int_set:N = \l__nicematrix_multiplicity_int ,
+    multiplicity .initial:n = 1 ,
+    multiplicity .value_required:n = true ,
+    tikz .code:n = \bool_set_true:N \l__nicematrix_tikz_rule_bool ,
+    total-width .code:n = \dim_set:Nn \l__nicematrix_rule_width_dim { #1 }
+                          \bool_set_true:N \l__nicematrix_total_width_bool ,
+    total-width .value_required:n = true ,
+    width .meta:n = { total-width = #1 } ,
+    dotted .code:n = \bool_set_true:N \l__nicematrix_dotted_rule_bool ,
+  }
+\cs_new_protected:Npn \__nicematrix_h_custom_line:n #1
   {
     \cs_set:cpn { nicematrix - \l__nicematrix_command_str }
       {
         \noalign
           {
-            \skip_vertical:n { #2 }
+            \__nicematrix_compute_rule_width:n { #1 }
+            \skip_vertical:n { \l__nicematrix_rule_width_dim }
             \tl_gput_right:Nx \g__nicematrix_internal_code_after_tl
-              { \__nicematrix_hline:n { #1 , position = \int_eval:n { \c@iRow + 1 } } }
+              {
+                \__nicematrix_hline:n
+                  {
+                    #1 ,
+                    position = \int_eval:n { \c@iRow + 1 } ,
+                    total-width = \dim_use:N \l__nicematrix_rule_width_dim
+                  }
+              }
           }
       }
     \seq_put_left:NV \l__nicematrix_custom_line_commands_seq \l__nicematrix_command_str
   }
-\cs_generate_variant:Nn \__nicematrix_define_h_custom_line:nn { n V }
-\cs_new_protected:Npn \__nicematrix_custom_line_i:n #1
+\cs_generate_variant:Nn \__nicematrix_h_custom_line:nn { n V }
+\cs_new_protected:Npn \__nicematrix_compute_rule_width:n #1
   {
-    \bool_if:NF \l_tmpa_bool
+    \bool_set_false:N \l__nicematrix_tikz_rule_bool
+    \bool_set_false:N \l__nicematrix_total_width_bool
+    \bool_set_false:N \l__nicematrix_dotted_rule_bool
+    \keys_set_known:nn { NiceMatrix / custom-line-width } { #1 }
+    \bool_if:NF \l__nicematrix_total_width_bool
       {
-        \dim_set:Nn \l__nicematrix_rule_width_dim
+        \bool_if:NTF \l__nicematrix_dotted_rule_bool
+          { \dim_set:Nn \l__nicematrix_rule_width_dim { 2 \l__nicematrix_xdots_radius_dim } }
           {
-            \arrayrulewidth * \l__nicematrix_tmpc_int
-            + \doublerulesep * ( \l__nicematrix_tmpc_int - 1)
+            \bool_if:NF \l__nicematrix_tikz_rule_bool
+              {
+                \dim_set:Nn \l__nicematrix_rule_width_dim
+                  {
+                    \arrayrulewidth * \l__nicematrix_multiplicity_int
+                    + \doublerulesep * ( \l__nicematrix_multiplicity_int - 1 )
+                  }
+              }
           }
       }
+  }
+\cs_new_protected:Npn \__nicematrix_v_custom_line:n #1
+  {
+    \__nicematrix_compute_rule_width:n { #1 }
     \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
       {
-        \exp_not:N !
-          { \skip_horizontal:n { \dim_use:N \l__nicematrix_rule_width_dim } }
+        \__nicematrix_vline:n
+          {
+            #1 ,
+            position = \int_eval:n { \c@jCol + 1 } ,
+            total-width = \dim_use:N \l__nicematrix_rule_width_dim
+          }
       }
-     \tl_gput_right:Nx \g__nicematrix_internal_code_after_tl
-      { \__nicematrix_vline:n { #1 , position = \int_eval:n { \c@jCol + 1 } } }
   }
 \__nicematrix_custom_line:n { letter = : , command = hdottedline , dotted }
-\cs_new_protected:Npn \__nicematrix_test_hline_in_block:nnnnn #1 #2 #3 #4
+\cs_new_protected:Npn \__nicematrix_test_hline_in_block:nnnnn #1 #2 #3 #4 #5
   {
     \bool_lazy_all:nT
       {
@@ -5367,7 +5431,7 @@
       }
       { \bool_gset_false:N \g_tmpa_bool }
   }
-\cs_new_protected:Npn \__nicematrix_test_vline_in_block:nnnnn #1 #2 #3 #4
+\cs_new_protected:Npn \__nicematrix_test_vline_in_block:nnnnn #1 #2 #3 #4 #5
   {
     \bool_lazy_all:nT
       {
@@ -5512,20 +5576,6 @@
           }
       }
   }
-\cs_new:Npn \__nicematrix_hdottedline:
-  {
-    \noalign { \skip_vertical:N 2\l__nicematrix_xdots_radius_dim }
-    \__nicematrix_hdottedline_i:
-  }
-\cs_new_protected:Npn \__nicematrix_hdottedline_i:
-  {
-    \tl_gput_right:Nx \g__nicematrix_internal_code_after_tl
-      { \__nicematrix_hdottedline:n { \int_use:N \c@iRow } }
-  }
-\cs_new_protected:Npn \__nicematrix_hdottedline:n #1
-  { \__nicematrix_hline:n { position = #1 , end = \int_use:N \c@jCol , dotted } }
-\cs_new_protected:Npn \__nicematrix_vdottedline:n #1
-  { \__nicematrix_vline:n { position = \int_eval:n { #1 + 1 } , dotted } }
 \bool_new:N \l__nicematrix_block_auto_columns_width_bool
 \keys_define:nn { NiceMatrix / NiceMatrixBlock }
   {
@@ -6458,7 +6508,8 @@
               {
                 position = ##1 ,
                 start = \l__nicematrix_tmpd_tl ,
-                end = \int_eval:n { \l_tmpb_tl - 1 }
+                end = \int_eval:n { \l_tmpb_tl - 1 } ,
+                total-width = \arrayrulewidth
               }
           }
       }
@@ -6866,7 +6917,7 @@
     hvlines .value_forbidden:n = true ,
     name .code:n =
       \tl_if_empty:nTF { #1 }
-        { \__nicematrix_error:n { Invalid~name~format } }
+        { \__nicematrix_error:n { Invalid~name } }
         {
           \regex_match:nnTF { \A[A-Za-z][A-Za-z0-9]*\Z } { #1 }
             {
@@ -6877,7 +6928,7 @@
                   \seq_gput_right:Nn \g__nicematrix_submatrix_names_seq { #1 }
                 }
             }
-            { \__nicematrix_error:n { Invalid~name~format } }
+            { \__nicematrix_error:n { Invalid~name } }
         } ,
     rules .code:n = \keys_set:nn { NiceMatrix / rules } { #1 } ,
     rules .value_required:n = true ,
@@ -6973,10 +7024,10 @@
               }
           }
         \dim_compare:nNnTF \l__nicematrix_x_initial_dim = \c_max_dim
-          { \__nicematrix_error:nn { impossible~delimiter } { left } }
+          { \__nicematrix_error:nn { Impossible~delimiter } { left } }
           {
             \dim_compare:nNnTF \l__nicematrix_x_final_dim = { - \c_max_dim }
-              { \__nicematrix_error:nn { impossible~delimiter } { right } }
+              { \__nicematrix_error:nn { Impossible~delimiter } { right } }
               { \__nicematrix_sub_matrix_i:nnnn { #1 } { #4 } { #6 } { #7 } }
           }
         \endpgfpicture
@@ -7370,39 +7421,47 @@
   }
 \NewDocumentCommand \__nicematrix_ShowCellNames { }
  {
+   \dim_zero_new:N \g__nicematrix_tmpc_dim
+   \dim_zero_new:N \g__nicematrix_tmpd_dim
+   \dim_zero_new:N \g__nicematrix_tmpe_dim
    \int_step_inline:nn \c@iRow
      {
-       \begin { tikzpicture }
+       \begin { pgfpicture }
        \__nicematrix_qpoint:n { row - ##1 }
        \dim_set_eq:NN \l_tmpa_dim \pgf@y
        \__nicematrix_qpoint:n { row - \int_eval:n { ##1 + 1 } }
        \dim_gset:Nn \g_tmpa_dim { ( \l_tmpa_dim + \pgf@y ) / 2 }
        \dim_gset:Nn \g_tmpb_dim { \l_tmpa_dim - \pgf@y }
-       \end { tikzpicture }
+       \end { pgfpicture }
        \int_step_inline:nn \c@jCol
          {
            \hbox_set:Nn \l_tmpa_box
              { \normalfont \Large \color { red ! 50 } ##1 - ####1 }
-           \begin { tikzpicture }
+           \begin { pgfpicture }
            \__nicematrix_qpoint:n { col - ####1 }
-           \dim_set_eq:NN \l__nicematrix_tmpc_dim \pgf@x
+           \dim_gset_eq:NN \g__nicematrix_tmpc_dim \pgf@x
            \__nicematrix_qpoint:n { col - \int_eval:n { ####1 + 1 } }
-           \dim_set:Nn \l_tmpa_dim { \pgf@x - \l__nicematrix_tmpc_dim }
+           \dim_gset:Nn \g__nicematrix_tmpd_dim { \pgf@x - \g__nicematrix_tmpc_dim }
+           \dim_gset_eq:NN \g__nicematrix_tmpe_dim \pgf@x
+           \end { pgfpicture }
            \fp_set:Nn \l_tmpa_fp
              {
                \fp_min:nn
                  {
                    \fp_min:nn
-                     { \dim_ratio:nn { \l_tmpa_dim } { \box_wd:N \l_tmpa_box } }
+                     { \dim_ratio:nn { \g__nicematrix_tmpd_dim } { \box_wd:N \l_tmpa_box } }
                      { \dim_ratio:nn { \g_tmpb_dim } { \box_ht_plus_dp:N \l_tmpa_box } }
                  }
                  { 1.0 }
              }
            \box_scale:Nnn \l_tmpa_box { \fp_use:N \l_tmpa_fp } { \fp_use:N \l_tmpa_fp }
+           \pgfpicture
+           \pgfrememberpicturepositiononpagetrue
+           \pgf@relevantforpicturesizefalse
            \pgftransformshift
              {
                \pgfpoint
-                 { 0.5 * ( \l__nicematrix_tmpc_dim + \pgf@x ) }
+                 { 0.5 * ( \g__nicematrix_tmpc_dim + \g__nicematrix_tmpe_dim ) }
                  { \dim_use:N \g_tmpa_dim }
              }
            \pgfnode
@@ -7411,23 +7470,24 @@
              { \box_use:N \l_tmpa_box }
              { }
              { }
-           \end { tikzpicture }
+           \endpgfpicture
          }
      }
  }
+\bool_new:N \c__nicematrix_messages_for_Overleaf_bool
 \bool_new:N \c__nicematrix_footnotehyper_bool
 \bool_new:N \c__nicematrix_footnote_bool
-\__nicematrix_msg_new:nnn { Unknown~key~for~package }
+\msg_new:nnnn { nicematrix } { Unknown~key~for~package }
   {
     The~key~'\l_keys_key_str'~is~unknown. \\
-    If~you~go~on,~it~will~be~ignored. \\
+    That~key~will~be~ignored. \\
     For~a~list~of~the~available~keys,~type~H~<return>.
   }
   {
     The~available~keys~are~(in~alphabetic~order):~
-    allow-letter-for-dotted-lines,~
     footnote,~
     footnotehyper,~
+    messages-for-Overleaf,~
     renew-dots,~and
     renew-matrix.
   }
@@ -7437,18 +7497,9 @@
     renew-dots .value_forbidden:n = true ,
     renew-matrix .code:n = \__nicematrix_renew_matrix: ,
     renew-matrix .value_forbidden:n = true ,
-    transparent .code:n = \__nicematrix_fatal:n { Key~transparent } ,
-    transparent .value_forbidden:n = true,
+    messages-for-Overleaf .bool_set:N = \c__nicematrix_messages_for_Overleaf_bool ,
     footnote .bool_set:N = \c__nicematrix_footnote_bool ,
     footnotehyper .bool_set:N = \c__nicematrix_footnotehyper_bool ,
-    allow-letter-for-dotted-lines .code:n =
-     {
-       \group_begin:
-       \globaldefs = 1
-       \__nicematrix_msg_redirect_name:nn { letter-for-dotted-lines } { none }
-       \group_end:
-     } ,
-    allow-letter-for-dotted-lines .value_forbidden:n = true ,
     unknown .code:n = \__nicematrix_error:n { Unknown~key~for~package }
   }
 \ProcessKeysOptions { NiceMatrix / Package }
@@ -7459,7 +7510,7 @@
     If~you~want,~you~can~use~the~option~'footnotehyper'~and~the~footnotes~
     within~the~environments~of~nicematrix~will~be~extracted~with~the~tools~
     of~the~package~footnotehyper.\\
-    If~you~go~on,~the~package~footnote~won't~be~loaded.
+    The~package~footnote~won't~be~loaded.
   }
 \__nicematrix_msg_new:nn { footnotehyper~with~footnote~package }
   {
@@ -7468,7 +7519,7 @@
     If~you~want,~you~can~use~the~option~'footnote'~and~the~footnotes~
     within~the~environments~of~nicematrix~will~be~extracted~with~the~tools~
     of~the~package~footnote.\\
-    If~you~go~on,~the~package~footnotehyper~won't~be~loaded.
+    The~package~footnotehyper~won't~be~loaded.
   }
 \bool_if:NT \c__nicematrix_footnote_bool
   {
@@ -7491,6 +7542,12 @@
       }
     \bool_set_true:N \c__nicematrix_footnote_bool
   }
+\bool_if:NTF \c__nicematrix_messages_for_Overleaf_bool
+  { \str_const:Nn \c__nicematrix_available_keys_str { } }
+  {
+    \str_const:Nn \c__nicematrix_available_keys_str
+      { For~a~list~of~the~available~keys,~type~H~<return>. }
+  }
 \seq_new:N \g__nicematrix_types_of_matrix_seq
 \seq_gset_from_clist:Nn \g__nicematrix_types_of_matrix_seq
   {
@@ -7519,19 +7576,31 @@
   }
 \__nicematrix_msg_new:nn { negative~weight }
   {
+    Negative~weight.\\
     The~weight~of~the~'X'~columns~must~be~positive~and~you~have~used~
-    the~value~'#1'.~If~you~go~on,~the~absolute~value~will~be~used.
+    the~value~'#1'.\\
+    The~absolute~value~will~be~used.
+  }
+\__nicematrix_msg_new:nn { last~col~not~used }
+  {
+    Column~not~used.\\
+    The~key~'last-col'~is~in~force~but~you~have~not~used~that~last~column~
+    in~your~\__nicematrix_full_name_env:.~However,~you~can~go~on.
   }
 \__nicematrix_msg_new:nn { too~much~cols~for~matrix~with~last~col }
   {
-    You~try~to~use~more~columns~than~allowed~by~your~
-    \__nicematrix_full_name_env:.\__nicematrix_message_hdotsfor:\ The~maximal~number~of~
-    columns~is~\int_eval:n { \l__nicematrix_last_col_int - 1 }~(plus~the~
-    exterior~columns).~This~error~is~fatal.
+    Too~much~columns.\\
+    In~the~row~\int_eval:n { \c@jCol - 1 },~
+    you~try~to~use~more~columns~
+    than~allowed~by~your~\__nicematrix_full_name_env:.\__nicematrix_message_hdotsfor:\
+    The~maximal~number~of~columns~is~\int_eval:n { \l__nicematrix_last_col_int - 1 }~
+    (plus~the~exterior~columns).~This~error~is~fatal.
   }
 \__nicematrix_msg_new:nn { too~much~cols~for~matrix }
   {
-    You~try~to~use~more~columns~than~allowed~by~your~
+    Too~much~columns.\\
+    In~the~row~\int_eval:n { \c@jCol - 1 },~
+    you~try~to~use~more~columns~than~allowed~by~your~
     \__nicematrix_full_name_env:.\__nicematrix_message_hdotsfor:\ Recall~that~the~maximal~
     number~of~columns~for~a~matrix~is~fixed~by~the~LaTeX~counter~
     'MaxMatrixCols'.~Its~actual~value~is~\int_use:N \c@MaxMatrixCols.~
@@ -7539,7 +7608,9 @@
   }
 \__nicematrix_msg_new:nn { too~much~cols~for~array }
   {
-    You~try~to~use~more~columns~than~allowed~by~your~
+    Too~much~columns.\\
+    In~the~row~\int_eval:n { \c@jCol - 1 },~
+    ~you~try~to~use~more~columns~than~allowed~by~your~
     \__nicematrix_full_name_env:.\__nicematrix_message_hdotsfor:\ The~maximal~number~of~columns~is~
     \int_use:N \g__nicematrix_static_num_of_col_int\
     ~(plus~the~potential~exterior~ones).~
@@ -7547,62 +7618,65 @@
   }
 \__nicematrix_msg_new:nn { hvlines-except-corners }
   {
+    Obsolete~key.\\
     The~key~'hvlines-except-corners'~is~now~obsolete.~You~should~instead~use~the~
     keys~'hvlines'~and~'corners'.\\
-    However,~you~can~go~on~for~this~time.~This~message~won't~be~shown~anymore~
-    in~this~document.
-  }
-\__nicematrix_msg_new:nn { last~col~not~used }
-  {
-    The~key~'last-col'~is~in~force~but~you~have~not~used~that~last~column~
-    in~your~\__nicematrix_full_name_env:.~However,~you~can~go~on.
+    This~error~is~fatal.
   }
 \__nicematrix_msg_new:nn { columns~not~used }
   {
+    Columns~not~used.\\
     The~preamble~of~your~\__nicematrix_full_name_env:\ announces~\int_use:N
     \g__nicematrix_static_num_of_col_int\ columns~but~you~use~only~\int_use:N \c@jCol.\\
-    You~can~go~on~but~the~columns~you~did~not~used~won't~be~created.
+    The~columns~you~did~not~used~won't~be~created.
   }
 \__nicematrix_msg_new:nn { in~first~col }
   {
+    Erroneous~use.\\
     You~can't~use~the~command~#1 in~the~first~column~(number~0)~of~the~array.\\
-    If~you~go~on,~this~command~will~be~ignored.
+    That~command~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { in~last~col }
   {
+    Erroneous~use.\\
     You~can't~use~the~command~#1 in~the~last~column~(exterior)~of~the~array.\\
-    If~you~go~on,~this~command~will~be~ignored.
+    That~command~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { in~first~row }
   {
+    Erroneous~use.\\
     You~can't~use~the~command~#1 in~the~first~row~(number~0)~of~the~array.\\
-    If~you~go~on,~this~command~will~be~ignored.
+    That~command~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { in~last~row }
   {
     You~can't~use~the~command~#1 in~the~last~row~(exterior)~of~the~array.\\
-    If~you~go~on,~this~command~will~be~ignored.
+    That~command~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { double~closing~delimiter }
   {
+    Double~delimiter.\\
     You~can't~put~a~second~closing~delimiter~"#1"~just~after~a~first~closing~
     delimiter.~This~delimiter~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { delimiter~after~opening }
   {
+    Double~delimiter.\\
     You~can't~put~a~second~delimiter~"#1"~just~after~a~first~opening~
-    delimiter.~This~delimiter~will~be~ignored.
+    delimiter.~That~delimiter~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { bad~option~for~line-style }
   {
+    Bad~line~style.\\
     Since~you~haven't~loaded~Tikz,~the~only~value~you~can~give~to~'line-style'~
-    is~'standard'.~If~you~go~on,~this~key~will~be~ignored.
+    is~'standard'.~That~key~will~be~ignored.
   }
 \__nicematrix_msg_new:nnn { Unknown~key~for~custom-line }
   {
+    Unknown~key.\\
     The~key~'\l_keys_key_str'~is~unknown~in~a~'custom-line'.~
-    If~you~go~on,~it~will~be~ignored. \\
-    For~a~list~of~the~available~keys,~type~H~<return>.
+    It~will~be~ignored. \\
+    \c__nicematrix_available_keys_str
   }
   {
     The~available~keys~are~(in~alphabetic~order):~
@@ -7612,134 +7686,146 @@
     letter,~
     multiplicity,~
     sep-color,~
-    tikz,~and~width.
+    tikz,~and~tota-width.
   }
 \__nicematrix_msg_new:nn { Unknown~key~for~xdots }
   {
+    Unknown~key.\\
     As~for~now,~there~is~only~five~keys~available~here:~'color',~'inter',~
     'line-style',~'radius',~
     and~'shorten'~(and~you~try~to~use~'\l_keys_key_str').~
-    If~you~go~on,~this~key~will~be~ignored.
+    That~key~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { Unknown~key~for~rowcolors }
   {
+    Unknown~key.\\
     As~for~now,~there~is~only~two~keys~available~here:~'cols'~and~'respect-blocks'~
-    (and~you~try~to~use~'\l_keys_key_str').~If~you~go~on,~
-    this~key~will~be~ignored.
-  }
-\__nicematrix_msg_new:nn { ampersand~in~light-syntax }
-  {
-    You~can't~use~an~ampersand~(\token_to_str:N &)~to~separate~columns~because~
-    ~you~have~used~the~key~'light-syntax'.~This~error~is~fatal.
+    (and~you~try~to~use~'\l_keys_key_str')\\
+    That~key~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { Construct~too~large }
   {
+    Construct~too~large.\\
     Your~command~\token_to_str:N #1
     can't~be~drawn~because~your~matrix~is~too~small.\\
-    If~you~go~on,~this~command~will~be~ignored.
+    That~command~will~be~ignored.
   }
-\__nicematrix_msg_new:nn { double-backslash~in~light-syntax }
+\__nicematrix_msg_new:nn { ampersand~in~light-syntax }
   {
-    You~can't~use~\token_to_str:N \\~to~separate~rows~because~you~have~used~
-    the~key~'light-syntax'.~You~must~use~the~character~'\l__nicematrix_end_of_row_tl'~
-    (set~by~the~key~'end-of-row').~This~error~is~fatal.
+    Ampersand~forbidden.\\
+    You~can't~use~an~ampersand~(\token_to_str:N &)~to~separate~columns~because~
+    ~the~key~'light-syntax'~is~in~force.~This~error~is~fatal.
   }
-\__nicematrix_msg_new:nn { standard-cline~in~document }
+\__nicematrix_msg_new:nn { double-backslash~in~light-syntax }
   {
-    The~key~'standard-cline'~is~available~only~in~the~preamble.\\
-    If~you~go~on~this~command~will~be~ignored.
+    Double~backslash~forbidden.\\
+    You~can't~use~\token_to_str:N
+    \\~to~separate~rows~because~the~key~'light-syntax'~
+    is~in~force.~You~must~use~the~character~'\l__nicematrix_end_of_row_tl'~
+    (set~by~the~key~'end-of-row').~This~error~is~fatal.
   }
 \__nicematrix_msg_new:nn { bad~value~for~baseline }
   {
+    Bad~value~for~baseline.\\
     The~value~given~to~'baseline'~(\int_use:N \l_tmpa_int)~is~not~
     valid.~The~value~must~be~between~\int_use:N \l__nicematrix_first_row_int\ and~
-    \int_use:N \g__nicematrix_row_total_int\ or~equal~to~'t',~'c'~or~'b'.\\
-    If~you~go~on,~a~value~of~1~will~be~used.
+    \int_use:N \g__nicematrix_row_total_int\ or~equal~to~'t',~'c'~or~'b'~or~of~
+    the~form~'line-i'.\\
+    A~value~of~1~will~be~used.
   }
-\__nicematrix_msg_new:nn { Invalid~name~format }
+\__nicematrix_msg_new:nn { Invalid~name }
   {
+    Invalid~name.\\
     You~can't~give~the~name~'\l_keys_value_tl'~to~a~\token_to_str:N
-    \SubMatrix.\\
+    \SubMatrix\ of~your~\__nicematrix_full_name_env:.\\
     A~name~must~be~accepted~by~the~regular~expression~[A-Za-z][A-Za-z0-9]*.\\
-    If~you~go~on,~this~key~will~be~ignored.
+    This~key~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { Wrong~line~in~SubMatrix }
   {
+    Wrong~line.\\
     You~try~to~draw~a~#1~line~of~number~'#2'~in~a~
     \token_to_str:N \SubMatrix\ of~your~\__nicematrix_full_name_env:\ but~that~
-    number~is~not~valid.~If~you~go~on,~it~will~be~ignored.
+    number~is~not~valid.~It~will~be~ignored.
   }
-\__nicematrix_msg_new:nn { impossible~delimiter }
+\__nicematrix_msg_new:nn { Impossible~delimiter }
   {
+    Impossible~delimiter.\\
     It's~impossible~to~draw~the~#1~delimiter~of~your~
     \token_to_str:N \SubMatrix\ because~all~the~cells~are~empty~
     in~that~column.
     \bool_if:NT \l__nicematrix_submatrix_slim_bool
       { ~Maybe~you~should~try~without~the~key~'slim'. } \\
-    If~you~go~on,~this~\token_to_str:N \SubMatrix\ will~be~ignored.
+    This~\token_to_str:N \SubMatrix\ will~be~ignored.
   }
 \__nicematrix_msg_new:nn { width~without~X~columns }
   {
+    No~X~column.\\
     You~have~used~the~key~'width'~but~you~have~put~no~'X'~column. \\
-    If~you~go~on,~that~key~will~be~ignored.
+    That~key~will~be~ignored.
+  }
+\__nicematrix_msg_new:nn { key~multiplicity~with~dotted }
+  {
+    Incompatible~keys. \\
+    You~have~used~the~key~'multiplicity'~with~the~key~'dotted'~
+    in~a~'custom-line'.~They~are~incompatible. \\
+    The~key~'multiplicity'~will~be~discarded.
   }
 \__nicematrix_msg_new:nn { empty~environment }
-  { Your~\__nicematrix_full_name_env:\ is~empty.~This~error~is~fatal. }
+  {
+    Empty~environment.\\
+    Your~\__nicematrix_full_name_env:\ is~empty.~This~error~is~fatal.
+  }
 \__nicematrix_msg_new:nn { Wrong~use~of~v-center }
   {
+    Wrong~use~of~v-center.\\
     You~should~not~use~the~key~'v-center'~here~because~your~block~is~not~
     mono-row.~However,~you~can~go~on.
   }
 \__nicematrix_msg_new:nn { No~letter~and~no~command }
   {
+    Erroneous~use.\\
     Your~use~of~'custom-line'~is~no-op~since~you~don't~have~used~the~
     key~'letter'~(for~a~letter~for~vertical~rules)~nor~the~key~'command'~
     (to~draw~horizontal~rules).\\
     However,~you~can~go~on.
   }
-\__nicematrix_msg_new:nn { letter-for-dotted-lines }
-  {
-    The~key~'letter-for-dotted-lines'~is~now~obsolete~(you~should~
-    use~'custom-line'~instead).~However,~you~can~go~on~for~this~time.~
-    If~you~don't~want~to~see~that~message~again,~you~should~
-    load~'nicematrix'~with~the~key~'allow-letter-for-dotted-lines'.~
-    However,~'letter-for-dotted-lines'~will~be~deleted~in~a~future~
-    version~of~'nicematrix'.
-  }
 \__nicematrix_msg_new:nn { Forbidden~letter }
   {
+    Forbidden~letter.\\
     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.
+    It~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { Several~letters }
   {
-    You~must~use~only~one~letter~as~value~for~the~key~'letter'~(and~
+    Wrong~name.\\
+    You~must~use~only~one~letter~as~value~for~the~key~'letter'~(and~you~
     have~used~'\l__nicematrix_letter_str').\\
-    If~you~go~on,~it~will~be~ignored.
+    It~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { Delimiter~with~small }
   {
+    Delimiter~forbidden.\\
     You~can't~put~a~delimiter~in~the~preamble~of~your~\__nicematrix_full_name_env:\
     because~the~key~'small'~is~in~force.\\
     This~error~is~fatal.
   }
 \__nicematrix_msg_new:nn { unknown~cell~for~line~in~CodeAfter }
   {
-    Your~command~\token_to_str:N\line\{#1\}\{#2\}~in~the~'code-after'~
+    Unknown~cell.\\
+    Your~command~\token_to_str:N\line\{#1\}\{#2\}~in~
+    the~\token_to_str:N \CodeAfter\ of~your~\__nicematrix_full_name_env:\
     can't~be~executed~because~a~cell~doesn't~exist.\\
-    If~you~go~on~this~command~will~be~ignored.
+    This~command~\token_to_str:N \line\ will~be~ignored.
   }
 \__nicematrix_msg_new:nnn { Duplicate~name~for~SubMatrix }
   {
+    Duplicate~name.\\
     The~name~'#1'~is~already~used~for~a~\token_to_str:N \SubMatrix\
     in~this~\__nicematrix_full_name_env:.\\
-    If~you~go~on,~this~key~will~be~ignored.\\
-    For~a~list~of~the~names~already~used,~type~H~<return>.
+    This~key~will~be~ignored.\\
+    \bool_if:NF \c__nicematrix_messages_for_Overleaf_bool
+      { For~a~list~of~the~names~already~used,~type~H~<return>. }
   }
   {
     The~names~already~defined~in~this~\__nicematrix_full_name_env:\ are:~
@@ -7747,41 +7833,46 @@
   }
 \__nicematrix_msg_new:nn { r~or~l~with~preamble }
   {
+    Erroneous~use.\\
     You~can't~use~the~key~'\l_keys_key_str'~in~your~\__nicematrix_full_name_env:.~
     You~must~specify~the~alignment~of~your~columns~with~the~preamble~of~
     your~\__nicematrix_full_name_env:.\\
-    If~you~go~on,~this~key~will~be~ignored.
+    This~key~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { Hdotsfor~in~col~0 }
   {
+    Erroneous~use.\\
     You~can't~use~\token_to_str:N \Hdotsfor\ in~an~exterior~column~of~
     the~array.~This~error~is~fatal.
   }
 \__nicematrix_msg_new:nn { bad~corner }
   {
-    #1~is~an~incorrect~specification~for~a~corner~(in~the~keys~
-    'corners'~and~'except-corners').~The~available~
-    values~are:~NW,~SW,~NE~and~SE.\\
-    If~you~go~on,~this~specification~of~corner~will~be~ignored.
+    Bad~corner.\\
+    #1~is~an~incorrect~specification~for~a~corner~(in~the~key~
+    'corners').~The~available~values~are:~NW,~SW,~NE~and~SE.\\
+    This~specification~of~corner~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { bad~border }
   {
+    Bad~border.\\
     \l_keys_key_str\space~is~an~incorrect~specification~for~a~border~
     (in~the~key~'borders'~of~the~command~\token_to_str:N \Block).~
     The~available~values~are:~left,~right,~top~and~bottom~(and~you~can~
     also~use~the~key~'tikz'
     \bool_if:nF \c__nicematrix_tikz_loaded_bool
       {~if~you~load~the~LaTeX~package~'tikz'}).\\
-    If~you~go~on,~this~specification~of~border~will~be~ignored.
+    This~specification~of~border~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { tikz~key~without~tikz }
   {
+    Tikz~not~loaded.\\
     You~can't~use~the~key~'tikz'~for~the~command~'\token_to_str:N
     \Block'~because~you~have~not~loaded~Tikz.~
-    If~you~go~on,~this~key~will~be~ignored.
+    This~key~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { last-col~non~empty~for~NiceArray }
   {
+    Erroneous~use.\\
     In~the~\__nicematrix_full_name_env:,~you~must~use~the~key~
     'last-col'~without~value.\\
     However,~you~can~go~on~for~this~time~
@@ -7789,6 +7880,7 @@
   }
 \__nicematrix_msg_new:nn { last-col~non~empty~for~NiceMatrixOptions }
   {
+    Erroneous~use.\\
     In~\NiceMatrixoptions,~you~must~use~the~key~
     'last-col'~without~value.\\
     However,~you~can~go~on~for~this~time~
@@ -7796,61 +7888,61 @@
   }
 \__nicematrix_msg_new:nn { Block~too~large~1 }
   {
+    Block~too~large.\\
     You~try~to~draw~a~block~in~the~cell~#1-#2~of~your~matrix~but~the~matrix~is~
     too~small~for~that~block. \\
   }
 \__nicematrix_msg_new:nn { Block~too~large~2 }
   {
+    Block~too~large.\\
     The~preamble~of~your~\__nicematrix_full_name_env:\ announces~\int_use:N
     \g__nicematrix_static_num_of_col_int\
     columns~but~you~use~only~\int_use:N \c@jCol\ and~that's~why~a~block~
     specified~in~the~cell~#1-#2~can't~be~drawn.~You~should~add~some~ampersands~
     (&)~at~the~end~of~the~first~row~of~your~
     \__nicematrix_full_name_env:.\\
-    If~you~go~on,this~block~and~maybe~others~will~be~ignored.
+    This~block~and~maybe~others~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { unknown~column~type }
   {
+    Bad~column~type.\\
     The~column~type~'#1'~in~your~\__nicematrix_full_name_env:\
     is~unknown. \\
     This~error~is~fatal.
   }
-\__nicematrix_msg_new:nn { colon~without~arydshln }
-  {
-    The~column~type~':'~in~your~\__nicematrix_full_name_env:\
-    is~unknown.~If~you~want~to~use~':'~of~'arydshln',~you~should~
-    load~that~package.~If~you~want~a~dotted~line~of~'nicematrix',~you~
-    should~use~'\l__nicematrix_letter_for_dotted_lines_str'.\\
-    This~error~is~fatal.
-  }
 \__nicematrix_msg_new:nn { tabularnote~forbidden }
   {
+    Forbidden~command.\\
     You~can't~use~the~command~\token_to_str:N\tabularnote\
     ~in~a~\__nicematrix_full_name_env:.~This~command~is~available~only~in~
     \{NiceTabular\},~\{NiceArray\}~and~\{NiceMatrix\}. \\
-    If~you~go~on,~this~command~will~be~ignored.
+    This~command~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { borders~forbidden }
   {
+    Forbidden~key.\\
     You~can't~use~the~key~'borders'~of~the~command~\token_to_str:N \Block\
     because~the~option~'rounded-corners'~
     is~in~force~with~a~non-zero~value.\\
-    If~you~go~on,~this~key~will~be~ignored.
+    This~key~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { bottomrule~without~booktabs }
   {
+    booktabs~not~loaded.\\
     You~can't~use~the~key~'tabular/bottomrule'~because~you~haven't~
     loaded~'booktabs'.\\
-    If~you~go~on,~this~key~will~be~ignored.
+    This~key~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { enumitem~not~loaded }
   {
+    enumitem~not~loaded.\\
     You~can't~use~the~command~\token_to_str:N\tabularnote\
     ~because~you~haven't~loaded~'enumitem'.\\
-    If~you~go~on,~this~command~will~be~ignored.
+    This~command~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { tikz~in~custom-line~without~tikz }
   {
+    Tikz~not~loaded.\\
     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~
@@ -7858,18 +7950,21 @@
   }
 \__nicematrix_msg_new:nn { tikz~in~borders~without~tikz }
   {
+    Tikz~not~loaded.\\
     You~have~used~the~key~'tikz'~in~a~key~'borders'~(of~a~
     command~'\token_to_str:N\Block')~but~Tikz~is~not~loaded.~
-    If~you~go~on,~that~key~will~be~ignored.
+    That~key~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { color~in~custom-line~with~tikz }
   {
+    Erroneous~use.\\
     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.
+    The~key~'color'~will~be~discarded.
   }
 \__nicematrix_msg_new:nn { Wrong~last~row }
   {
+    Wrong~number.\\
     You~have~used~'last-row=\int_use:N \l__nicematrix_last_row_int'~but~your~
     \__nicematrix_full_name_env:\ seems~to~have~\int_use:N \c@iRow \ rows.~
     If~you~go~on,~the~value~of~\int_use:N \c@iRow \ will~be~used~for~
@@ -7877,29 +7972,37 @@
     without~value~(more~compilations~might~be~necessary).
   }
 \__nicematrix_msg_new:nn { Yet~in~env }
-  { Environments~of~nicematrix~can't~be~nested.\\ This~error~is~fatal. }
+  {
+    Nested~environments.\\
+    Environments~of~nicematrix~can't~be~nested.\\
+    This~error~is~fatal.
+  }
 \__nicematrix_msg_new:nn { Outside~math~mode }
   {
+    Outside~math~mode.\\
     The~\__nicematrix_full_name_env:\ can~be~used~only~in~math~mode~
     (and~not~in~\token_to_str:N \vcenter).\\
     This~error~is~fatal.
   }
 \__nicematrix_msg_new:nn { One~letter~allowed }
   {
+    Bad~name.\\
     The~value~of~key~'\l_keys_key_str'~must~be~of~length~1.\\
-    If~you~go~on,~it~will~be~ignored.
+    It~will~be~ignored.
   }
 \__nicematrix_msg_new:nn { varwidth~not~loaded }
   {
+    varwidth~not~loaded.\\
     You~can't~use~the~column~type~'V'~because~'varwidth'~is~not~
     loaded.\\
-    If~you~go~on,~your~column~will~behave~like~'p'.
+    Your~column~will~behave~like~'p'.
   }
 \__nicematrix_msg_new:nnn { Unknown~key~for~Block }
   {
+    Unknown~key.\\
     The~key~'\l_keys_key_str'~is~unknown~for~the~command~\token_to_str:N
-    \Block.\\ If~you~go~on,~it~will~be~ignored. \\
-    For~a~list~of~the~available~keys,~type~H~<return>.
+    \Block.\\ It~will~be~ignored. \\
+    \c__nicematrix_available_keys_str
   }
   {
     The~available~keys~are~(in~alphabetic~order):~b,~borders,~c,~draw,~fill,~
@@ -7908,16 +8011,18 @@
   }
 \__nicematrix_msg_new:nn { Version~of~siunitx~too~old }
   {
+    siunitx~too~old.\\
     You~can't~use~'S'~columns~because~your~version~of~'siunitx'~
     is~too~old.~You~need~at~least~v~3.0.\\
     This~error~is~fatal.
   }
 \__nicematrix_msg_new:nnn { Unknown~key~for~Brace }
   {
+    Unknown~key.\\
     The~key~'\l_keys_key_str'~is~unknown~for~the~commands~\token_to_str:N
     \UnderBrace\ and~\token_to_str:N \OverBrace.\\
-    If~you~go~on,~it~will~be~ignored. \\
-    For~a~list~of~the~available~keys,~type~H~<return>.
+    It~will~be~ignored. \\
+    \c__nicematrix_available_keys_str
   }
   {
     The~available~keys~are~(in~alphabetic~order):~color,~left-shorten,~
@@ -7926,10 +8031,10 @@
   }
 \__nicematrix_msg_new:nnn { Unknown~key~for~CodeAfter }
   {
+    Unknown~key.\\
     The~key~'\l_keys_key_str'~is~unknown.\\
-    If~you~go~on,~it~will~be~ignored. \\
-    For~a~list~of~the~available~keys~in~\token_to_str:N
-    \CodeAfter,~type~H~<return>.
+    It~will~be~ignored. \\
+    \c__nicematrix_available_keys_str
   }
   {
     The~available~keys~are~(in~alphabetic~order):~
@@ -7941,10 +8046,10 @@
   }
 \__nicematrix_msg_new:nnn { Unknown~key~for~SubMatrix }
   {
+    Unknown~key.\\
     The~key~'\l_keys_key_str'~is~unknown.\\
-    If~you~go~on,~this~key~will~be~ignored. \\
-    For~a~list~of~the~available~keys~in~\token_to_str:N
-    \SubMatrix,~type~H~<return>.
+    That~key~will~be~ignored. \\
+    \c__nicematrix_available_keys_str
   }
   {
     The~available~keys~are~(in~alphabetic~order):~
@@ -7962,9 +8067,10 @@
   }
 \__nicematrix_msg_new:nnn { Unknown~key~for~notes }
   {
+    Unknown~key.\\
     The~key~'\l_keys_key_str'~is~unknown.\\
-    If~you~go~on,~it~will~be~ignored. \\
-    For~a~list~of~the~available~keys~about~notes,~type~H~<return>.
+    That~key~will~be~ignored. \\
+    \c__nicematrix_available_keys_str
   }
   {
     The~available~keys~are~(in~alphabetic~order):~
@@ -7981,10 +8087,11 @@
   }
 \__nicematrix_msg_new:nnn { Unknown~key~for~RowStyle }
   {
+    Unknown~key.\\
     The~key~'\l_keys_key_str'~is~unknown~for~the~command~
     \token_to_str:N \RowStyle. \\
-    If~you~go~on,~it~will~be~ignored. \\
-    For~a~list~of~the~available~keys,~type~H~<return>.
+    That~key~will~be~ignored. \\
+    \c__nicematrix_available_keys_str
   }
   {
     The~available~keys~are~(in~alphabetic~order):~
@@ -7998,10 +8105,11 @@
   }
 \__nicematrix_msg_new:nnn { Unknown~key~for~NiceMatrixOptions }
   {
+    Unknown~key.\\
     The~key~'\l_keys_key_str'~is~unknown~for~the~command~
     \token_to_str:N \NiceMatrixOptions. \\
-    If~you~go~on,~it~will~be~ignored. \\
-    For~a~list~of~the~*principal*~available~keys,~type~H~<return>.
+    That~key~will~be~ignored. \\
+    \c__nicematrix_available_keys_str
   }
   {
     The~available~keys~are~(in~alphabetic~order):~
@@ -8042,10 +8150,11 @@
   }
 \__nicematrix_msg_new:nnn { Unknown~key~for~NiceArray }
   {
+    Unknown~key.\\
     The~key~'\l_keys_key_str'~is~unknown~for~the~environment~
     \{NiceArray\}. \\
-    If~you~go~on,~it~will~be~ignored. \\
-    For~a~list~of~the~*principal*~available~keys,~type~H~<return>.
+    That~key~will~be~ignored. \\
+    \c__nicematrix_available_keys_str
   }
   {
     The~available~keys~are~(in~alphabetic~order):~
@@ -8090,15 +8199,18 @@
     tabularnote,~
     vlines,~
     xdots/color,~
+    xdots/shorten-start,~
+    xdots/shorten-end,~
     xdots/shorten~and~
     xdots/line-style.
   }
 \__nicematrix_msg_new:nnn { Unknown~key~for~NiceMatrix }
   {
+    Unknown~key.\\
     The~key~'\l_keys_key_str'~is~unknown~for~the~
     \__nicematrix_full_name_env:. \\
-    If~you~go~on,~it~will~be~ignored. \\
-    For~a~list~of~the~*principal*~available~keys,~type~H~<return>.
+    That~key~will~be~ignored. \\
+    \c__nicematrix_available_keys_str
   }
   {
     The~available~keys~are~(in~alphabetic~order):~
@@ -8142,15 +8254,18 @@
     t,~
     vlines,~
     xdots/color,~
+    xdots/shorten-start,~
+    xdots/shorten-end,~
     xdots/shorten~and~
     xdots/line-style.
   }
 \__nicematrix_msg_new:nnn { Unknown~key~for~NiceTabular }
   {
+    Unknown~key.\\
     The~key~'\l_keys_key_str'~is~unknown~for~the~environment~
     \{NiceTabular\}. \\
-    If~you~go~on,~it~will~be~ignored. \\
-    For~a~list~of~the~*principal*~available~keys,~type~H~<return>.
+    That~key~will~be~ignored. \\
+    \c__nicematrix_available_keys_str
   }
   {
     The~available~keys~are~(in~alphabetic~order):~
@@ -8194,18 +8309,21 @@
     tabularnote,~
     vlines,~
     xdots/color,~
+    xdots/shorten-start,~
+    xdots/shorten-end,~
     xdots/shorten~and~
     xdots/line-style.
   }
 \__nicematrix_msg_new:nnn { Duplicate~name }
   {
+    Duplicate~name.\\
     The~name~'\l_keys_value_tl'~is~already~used~and~you~shouldn't~use~
     the~same~environment~name~twice.~You~can~go~on,~but,~
     maybe,~you~will~have~incorrect~results~especially~
     if~you~use~'columns-width=auto'.~If~you~don't~want~to~see~this~
     message~again,~use~the~key~'allow-duplicate-names'~in~
     '\token_to_str:N \NiceMatrixOptions'.\\
-    For~a~list~of~the~names~already~used,~type~H~<return>. \\
+    \c__nicematrix_available_keys_str
   }
   {
     The~names~already~defined~in~this~document~are:~
@@ -8213,8 +8331,9 @@
   }
 \__nicematrix_msg_new:nn { Option~auto~for~columns-width }
   {
+    Erroneous~use.\\
     You~can't~give~the~value~'auto'~to~the~key~'columns-width'~here.~
-    If~you~go~on,~the~key~will~be~ignored.
+    That~key~will~be~ignored.
   }
 
 \endinput