load missing decorations library for tikz-cd

src/math/mathfig/mathfig.pysty

@@ -8,7 +8,7 @@ __HEADER__(Math figures with TikZ / pgfplots / xy)
 \pgfplotsset{compat=1.7}
 
 \RequirePackage{tikz} % Plots / drawings
-\usetikzlibrary{calc, intersections, through, quotes, angles, babel, positioning, snakes}
+\usetikzlibrary{calc, intersections, through, quotes, angles, babel, positioning, snakes, decorations.markings}
 
 \RequirePackage{tikz-cd} %Commutative diagrams
 \RequirePackage{xparse}
@@ -47,18 +47,19 @@ __HEADER__(Math figures with TikZ / pgfplots / xy)
 %% Fix for equal arrows in tikz, see
 % https://tex.stackexchange.com/questions/443017/equal-arrows-without-transparent-ends-possible-in-tikzcd
 
-\usetikzlibrary{decorations.markings}
 \tikzset {
-  double line with arrow/.style args=
-    { #1, #2 }
-    { decorate, decoration =
+  double line with arrow/.style args = 
+    {#1,#2}%
+    {
+      decorate, decoration =
         {
           markings,
           mark = at position 0 with
             {
               \coordinate (ta-base-1) at (0,1pt);
               \coordinate (ta-base-2) at (0,-1pt);
-          },
+            }
+          ,
           mark = at position 1 with
             {
               \draw[#1] (ta-base-1) -- (0,1pt);
@@ -67,4 +68,5 @@ __HEADER__(Math figures with TikZ / pgfplots / xy)
         }
     }
 }
+
 \tikzset{Equal/.style={-,double line with arrow={-,-}}}