\pgfmatrix: deduplicate halign header.

This is to simplify code without changing functionality.
Move \pgfmatrix@init@row out of halign header to this end.

Signed-off-by: Gábor Braun <[email protected]>

Author: gabor-braun

tex/generic/pgf/modules/pgfmodulematrix.code.tex

@@ -186,29 +186,17 @@
 }%
 \def\pgf@matrix@cont{%
     \setbox\pgf@matrix@box=\hbox\bgroup\vbox\bgroup%
-    \halign\bgroup%
     \pgf@matrix@init@row%
-    \pgf@matrix@step@column%
-    {%
-      \pgf@matrix@startcell%
-      ##%
-      % Warning: \pgf@matrix@startcell relies on the next token being
-      % \pgf@matrix@endcell here for checking emptiness of cell.
-      \pgf@matrix@endcell%
-    }%
-    % Add a token after & in user input,
-    % which provides content for the following cell and ends it.
-    \aftergroup\pgf@matrix@nextcell%
+    \halign\bgroup%
     &%
-    ##\pgf@matrix@padding&&%
     \pgf@matrix@step@column%
     {%
       \pgf@matrix@startcell%
       ##%
       % Warning: \pgf@matrix@startcell relies on the next token being
       % \pgf@matrix@endcell here for checking emptiness of cell.
       \pgf@matrix@endcell%
-    }
+    }%
     % Add a token after & in user input,
     % which provides content for the following cell and ends it.
     \aftergroup\pgf@matrix@nextcell%
@@ -322,7 +310,6 @@
 % Init a line
 
 \def\pgf@matrix@init@row{%
-  \relax%
   \global\advance\pgfmatrixcurrentrow by 1\relax%
   \global\pgfmatrixcurrentcolumn=0\relax%
   \expandafter\gdef\csname pgf@matrix@maxy\the\pgfmatrixcurrentrow\endcsname{0pt}%
@@ -640,6 +627,7 @@
   \else%
     \global\let\pgf@matrix@row@finish=\pgfutil@empty%
   \fi%
+  \pgf@matrix@init@row%
 }%