Keys for remembering macros/dimensions in foreach interations

The keys are `remember macro` and `remember dimension`.

Also `\tikz@foreach` was erroneously called `\tikz@patched@foreach`
(copied from my original testing file).

Signed-off-by: Andrew Stacey <[email protected]>

tex/generic/pgf/frontendlayer/tikz/tikz.code.tex

@@ -2580,6 +2580,11 @@
 
 \def\tikz@fchar oreach{\tikz@foreach}%
 
+
+  %
+  % These are to allow \foreach to remember macros and dimensions between iterations
+  %
+
 \def\tikzforeach@smugglers@cove{}
 \let\tikztostart=\relax
 
@@ -2622,8 +2627,16 @@
   %
 }
 
+  \tikzset{
+    remember macro/.code={
+      \tikzforeach@smuggle@macro#1
+    },
+    remember dimension/.code={
+      \tikzforeach@smuggle@dimen#1
+    }
+  }
 
-\def\tikz@patched@foreach{%
+\def\tikz@foreach{%
   \def\pgffor@beginhook{%
     \tikzforeach@smugglers@cove%
     \gdef\tikzforeach@smugglers@cove{}%