7 files changed, 47 insertions, 19 deletions
diff --git a/graphics/pgf/contrib/circuitikz/doc/changelog.tex b/graphics/pgf/contrib/circuitikz/doc/changelog.tex
index f4200948a6..283d1ca4f1 100644
--- a/graphics/pgf/contrib/circuitikz/doc/changelog.tex
+++ b/graphics/pgf/contrib/circuitikz/doc/changelog.tex
@@ -5,6 +5,18 @@ full list of changes.
 
 \begin{itemize}
 \item
+  Version 1.5.1 (2022-04-26)
+
+  Bug fix release.
+
+  \begin{itemize}
+  \tightlist
+  \item
+    Do not load package \texttt{regexpatch} by default, thanks to
+    \href{https://github.com/circuitikz/circuitikz/issues/628}{GitHub
+    user alceu-git}
+  \end{itemize}
+\item
   Version 1.5.0 (2022-04-22)
 
   In this version, several internal changes have been included in order
diff --git a/graphics/pgf/contrib/circuitikz/doc/circuitikz-context.pdf b/graphics/pgf/contrib/circuitikz/doc/circuitikz-context.pdf
index 7f8ee18f84..f4602c8d5d 100644
--- a/graphics/pgf/contrib/circuitikz/doc/circuitikz-context.pdf
+++ b/graphics/pgf/contrib/circuitikz/doc/circuitikz-context.pdf
diff --git a/graphics/pgf/contrib/circuitikz/doc/circuitikzmanual.pdf b/graphics/pgf/contrib/circuitikz/doc/circuitikzmanual.pdf
index 98f4c5b3a2..4d8265968e 100644
--- a/graphics/pgf/contrib/circuitikz/doc/circuitikzmanual.pdf
+++ b/graphics/pgf/contrib/circuitikz/doc/circuitikzmanual.pdf
diff --git a/graphics/pgf/contrib/circuitikz/doc/circuitikzmanual.tex b/graphics/pgf/contrib/circuitikz/doc/circuitikzmanual.tex
index 37e8bffc10..04431723a1 100644
--- a/graphics/pgf/contrib/circuitikz/doc/circuitikzmanual.tex
+++ b/graphics/pgf/contrib/circuitikz/doc/circuitikzmanual.tex
@@ -178,7 +178,8 @@ A similar approach for \ConTeXt\ is available, with the file \texttt{t-circuitik
 This manual has been typeset with \Circuitikz{} \pgfcircversion{} (\pgfcircversiondate) on \TikZ{} \pgfversion{} (\pgfversiondate).
 
 
-\subsection{Incompatible packages}
+\subsection{Incompatible packages}\label{sec:incompatible-packages}
+
 \TikZ's own \texttt{circuit} library, which was based on \Circuitikz, (re?)defines several styles used by this library. In order to have them work together you can use the \texttt{compatibility} package option, which basically prefixes the names of all \Circuitikz\ \texttt{to[]} styles with an asterisk.
 
 So, if loaded with said option, one must write \verb!(0,0) to[*R] (2,0)! and, for transistors on a path, \verb!(0,0) to[*Tnmos] (2,0)!, and so on (but \verb!(0,0) node[nmos] {}!). See example at page~\pageref{ex:compatibility}.
@@ -245,6 +246,7 @@ The \texttt{use fpu reciprocal} key seems to have no side effects, but given tha
 Here, we will provide a list of incompabilitys between different version of \Circuitikz. We will try to hold this list short, but sometimes it is easier to break with old syntax than including a lot of switches and compatibility layers. In general, changes that would invalidate a circuit (changes of polarity of components and so on) are almost always protected by a flag; the same is not true for purely aesthetic changes.
 If unsure, you can check the version at your local installation using the macro \verb!\pgfcircversion{}!.
 \begin{itemize}
+    \item Since \texttt{v1.5.1}\footnote{Do not use \texttt{v1.5.0}, it's buggy.} color management (see section~\ref{sec:colors}) and the details of how the shapes are drawn and protected by the external drawing options has changed. There should be no substantial changes to the circuits, though.
     \item The \TikZ{} fix for \texttt{to[...] +(x,y)} behavior (see~\ref{sec:path-relative-coordinates}) uncovered a bug in the positioning of the labels in \Circuitikz{} that is present since \texttt{v0.8}. So you \textbf{must} upgrade to \texttt{v1.4.1} or better if you have \TikZ{} newer than \texttt{3.1.8} (and you want/need to use the \texttt{+(x,y)} syntax).
     \item There have been changes in (internal) parameters for capacitors in \texttt{v1.4.1}; now to change them you should use the style interface (see~\ref{sec:capacitors-styling}).
     \item \Circuitikz{} \texttt{v1.4.0} introduce the rollback system for the package when using LaTeX; that (at least in principle) should be completely backward-compatible.
@@ -3308,10 +3310,10 @@ Choosing the proper left/right shape results in easily build ``mixed'' connector
 \begin{LTXexample}[varwidth=true, basicstyle=\small\ttfamily]
 \begin{circuitikz}[]
     \path (0,2); % for the bounding box, text is not accounted for
-    \draw (0,1) -- ++(1,0) node[iecsocketL](s1){S1};
-    \draw [red] (s1.e) node[iecplugR](p1){P1} (p1.e) -- ++(1,0);
+    \draw (0,1)--++(1,0) node[iecsocketL](s1){S1};
+    \draw [color=red](s1.e) node[iecplugR](p1){P1} (p1.e)--++(1,0);
     \draw (0,0) -- ++(1,0) node[iecplugL](p2){P2};
-    \draw[blue] (p2.e) node[iecsocketR](s2){S2} (s2.e) -- ++(1,0);
+    \draw [color=blue](p2.e) node[iecsocketR](s2){S2} (s2.e)--++(1,0);
 \end{circuitikz}
 \end{LTXexample}
 
@@ -8391,22 +8393,26 @@ To correct the line ending, there are support shapes to fill the missing rectang
 	\end{tikzpicture}
 \end{LTXexample}
 
-\section{Colors}
-
+\section{Colors}\label{sec:colors}
 
-Color support in \Circuitikz{} has been quite limited since version 1.5.0; form that one onward there has been an effort to make component's behavior more intuitive.
+Color support in \Circuitikz{} has been quite limited up to version 1.5.1; form that one onward there has been an effort to make component's behavior more intuitive.
 
 Part of the problem is how colors in paths are treated by \TikZ{} itself; you can see part of the discussion \href{https://github.com/circuitikz/circuitikz/issues/605}{this issue} and in \href{https://tex.stackexchange.com/questions/634987/pgf-basic-layer-struggling-again-with-colors}{this question on TeX.SX} --- many thanks to \texttt{@muzimuzhi} for helping there. Basically, nodes are drawn \emph{after} the path is completed, and color is applied to the path at the end. Look at this code (pure \TikZ, no \Circuitikz{} here):
 
 \begin{LTXexample}[varwidth=true]
-\tikz \draw[thick] (0,0) -- (1,0) {[color=red] -- (2,0) node[draw]{}} --(3,0);
-
+\tikz \draw[thick] (0,0) -- (1,0) {[color=red] -- (2,0) node[draw]{}} --(3,0); \par
 \tikz \draw[thick] (0,0) -- (1,0) [color=red] -- (2,0) node[draw]{} --(3,0);
 \end{LTXexample}
 
-So the path is drawn with the last ``effective'' (in current group) color. The deferred behavior of the color properties is very difficult to track for \Circuitikz, especially when the shorthand \texttt{color-name} (e.g., \texttt{red} instead of \texttt{color=red}) is used. \Circuitikz{} will try to patch the default commands to keep track of the ``current color''; if it fails will give a warning like \texttt{patch failed, use only explicit color=...}.
+So the path is drawn with the last ``effective'' (in current group) color. The deferred behavior of the color properties is very difficult to track for \Circuitikz, especially when the shorthand \texttt{color-name} (e.g., \texttt{red} instead of \texttt{color=red}) is used. \Circuitikz{} will try to keep track of the colors specified by \texttt{color=...} and \texttt{fill=...}, but if you use the implicit way (\texttt{\textbackslash draw[red]...}) it often fails.
 
-Before 1.5.0, \Circuitikz{} used black as the default color. Now it tries to follow the current color, as \TikZ does normally; but notice that there is a difference with the fill strategy:
+If you're adventurous, you can try to add
+\begin{lstlisting}[numbers=none]
+    \usepackage{regexpatch}\ctikzPatchImplicitColor
+\end{lstlisting}
+after loading \Circuitikz, and it will try to patch the default commands to keep track of the ``current color''; if it fails will give a warning like \texttt{patch failed, use only explicit color=...}. This is, unfortunately, not compatible with package \texttt{xpatch} (and much others, which load \texttt{xpatch}).\footnote{version \texttt{1.5.0} loaded it unconditionally for LaTeX; please do not use it}.
+
+Before 1.5.0, \Circuitikz{} used black as the default color. Now it tries to follow the current color, as \TikZ{} does normally; but notice that there is a difference with the fill strategy:
 
 \begin{LTXexample}[pos=t]
 \color{red}
@@ -8547,7 +8553,7 @@ This fill color will override any color defined by the style (see section~\ref{s
 ;\end{circuitikz}
 \end{LTXexample}
 
-You can combine shape colors with fill colors, too, but you should use the \texttt{draw} color option style for this:
+You can combine shape colors with fill colors, too, but you should use the explicit \texttt{color} option style for this:
 
 \begin{LTXexample}[varwidth=true]
 \begin{circuitikz} \draw[color=red]
@@ -8620,6 +8626,7 @@ Also, since \texttt{v1.2.3}, you can set the key \texttt{open poles fill} (defau
 \end{circuitikz}
 \end{LTXexample}
 
+
 \section{FAQ: Frequently asked questions}
 
 \def\faqQ{\par\medskip\noindent\textbf{Q: }}
diff --git a/graphics/pgf/contrib/circuitikz/tex/circuitikz.sty b/graphics/pgf/contrib/circuitikz/tex/circuitikz.sty
index c66633e787..73ef108579 100644
--- a/graphics/pgf/contrib/circuitikz/tex/circuitikz.sty
+++ b/graphics/pgf/contrib/circuitikz/tex/circuitikz.sty
@@ -16,8 +16,8 @@
 \providecommand\DeclareRelease[3]{}
 \providecommand\DeclareCurrentRelease[2]{}
 
-\def\pgfcircversion{1.5.0}
-\def\pgfcircversiondate{2022/02/22}
+\def\pgfcircversion{1.5.1}
+\def\pgfcircversiondate{2022/02/26}
 
 \DeclareRelease{0.4}{2012/12/20}{circuitikz-0.4-body.tex}
 \DeclareRelease{v0.4}{2012/12/20}{circuitikz-0.4-body.tex}
@@ -46,7 +46,6 @@
 
 %% Version 3.0 of pgf/TikZ is required
 \RequirePackage{tikz}
-\RequirePackage{regexpatch}%for color hack
 \usetikzlibrary{calc}
 %
 % "arrows" library is deprecated, and behave badly with
diff --git a/graphics/pgf/contrib/circuitikz/tex/pgfcirc.defines.tex b/graphics/pgf/contrib/circuitikz/tex/pgfcirc.defines.tex
index a5075f08f6..46ec314f57 100644
--- a/graphics/pgf/contrib/circuitikz/tex/pgfcirc.defines.tex
+++ b/graphics/pgf/contrib/circuitikz/tex/pgfcirc.defines.tex
@@ -105,8 +105,17 @@
 \pgfkeys{/tikz/fill/.add code={}{%
     \edef\ctikz@fillcolor{#1}}}
 %
+% This is to try to track the "implicit" color specification of Tikz,
+% like \draw[red,...] ...; which are not exactly the same than saying
+% \draw[color=red,...] ...;
+% This is too dangerous to issue by default (it was in 1.5.0 and it
+% was an error), so we will just define a command and tell it in the
+% manual.
+% It needs \usepackage{regexpatch} (which is not compatible with
+% xpatch, unfortunately)
 % I do not know how to do the xpatchcmd in ConTeXt...
 %
+\def\ctikzPatchImplicitColor{%
 \ifpgfutil@format@is@latex
     \pgfkeysgetvalue{/tikz/.unknown/.@cmd}{\my@temp}
     \xpatchcmd*\my@temp % use starred-form to replace all (two places actually)
@@ -119,8 +128,10 @@
     \pgfkeyslet{/tikz/.unknown/.@cmd}{\my@temp}
 \else
     \pgfutil@packagewarning{circuitikz}{%
-        Not on LaTeX: patch failed, use only explicit color=...(see manual)}
+        Not on LaTeX: patch failed, ^^J%
+        use only explicit color=...(see manual).}
 \fi
+}
 %
 \def\pgf@circ@setcolor{%
   \ifpgf@circ@setcolor
diff --git a/graphics/pgf/contrib/circuitikz/tex/t-circuitikz.tex b/graphics/pgf/contrib/circuitikz/tex/t-circuitikz.tex
index 5158fbb561..261eeafcc5 100644
--- a/graphics/pgf/contrib/circuitikz/tex/t-circuitikz.tex
+++ b/graphics/pgf/contrib/circuitikz/tex/t-circuitikz.tex
@@ -10,12 +10,11 @@
 %
 % See the files gpl-3.0_license.txt and lppl-1-3c_license.txt for more details.
 
-\def\pgfcircversion{1.5.0}
-\def\pgfcircversiondate{2022/02/22}
+\def\pgfcircversion{1.5.1}
+\def\pgfcircversiondate{2022/02/26}
 \writestatus{loading}{\pgfcircversiondate{} The CircuiTikz circuit drawing package version \pgfcircversion}
 
 \usemodule[tikz]
-\usemodule[regexpatch]%for color hack
 
 \startmodule[circuitikz]
 \usetikzlibrary[calc]