Remove \pgfkeys@ifcsname #863

This was only an alias for \ifcsname anyway and is luckily supported by
all formats (looking at you, ConTeXt).

Author: hmenke

tex/generic/pgf/utilities/pgfkeys.code.tex

@@ -43,8 +43,6 @@
   \csname @@end\expandafter\endcsname\expandafter\end%
 \fi
 
-\expandafter\let\expandafter\pgfkeys@ifcsname\csname ifcsname\endcsname%
-
 % Set a key to a value
 %
 % #1 = key
@@ -178,7 +176,7 @@
 %
 % \pgfkeysifdefined{/tikz/length}{key exists}{does not exist}
 
-\long\def\pgfkeysifdefined#1#2#3{\pgfkeys@ifcsname pgfk@#1\endcsname#2\else#3\fi}
+\long\def\pgfkeysifdefined#1#2#3{\ifcsname pgfk@#1\endcsname#2\else#3\fi}
 
 % Tests whether a key is assignable. For standard keys which just
 % store their value, this is identical to \pgfkeysifdefined.
@@ -420,7 +418,7 @@
 \def\pgfkeys@ifexecutehandler#1#2{#1}%
 \let\pgfkeys@ifexecutehandler@handleall=\pgfkeys@ifexecutehandler
 \def\pgfkeys@ifexecutehandler@handleonlyexisting#1#2{%
-  \pgfkeys@ifcsname pgfk@excpt@\pgfkeyscurrentname\endcsname%
+  \ifcsname pgfk@excpt@\pgfkeyscurrentname\endcsname%
      #1% ok, this particular key handler is known and should be processed in any case (for example .try)
   \else
      % implement the 'only existing' feature here:
@@ -431,7 +429,7 @@
 }%
 \def\pgfkeys@ifexecutehandler@handlefullorexisting#1#2{%
   \ifpgfkeysaddeddefaultpath
-    \pgfkeys@ifcsname pgfk@excpt@\pgfkeyscurrentname\endcsname%
+    \ifcsname pgfk@excpt@\pgfkeyscurrentname\endcsname%
        #1% ok, this particular key handler is known and be processed in any case (for example .try)
     \else
        % implement the 'only existing' feature here:
@@ -828,7 +826,7 @@
   }%
 }
 \def\pgfkeys@handle@boolean#1#2{%
-  \pgfkeys@ifcsname#1#2\endcsname%
+  \ifcsname#1#2\endcsname%
     \csname#1#2\endcsname%
   \else%
     \def\pgf@marshal{\pgfkeysvalueof{/errors/boolean expected/.@cmd}}%

tex/generic/pgf/utilities/pgfkeysfiltered.code.tex

@@ -264,7 +264,7 @@
 %
 % If the family exists, #2 will be executed. Otherwise, #3 will be
 % called.
-\long\def\pgfkeysiffamilydefined#1#2#3{\pgfkeys@ifcsname ifpgfk@#1/familyactive\endcsname#2\else#3\fi}
+\long\def\pgfkeysiffamilydefined#1#2#3{\ifcsname ifpgfk@#1/familyactive\endcsname#2\else#3\fi}
 
 % Sets the TeX boolean
 %   \ifpgfkeysfiltercontinue := ( family #1 is active )