Simplify setup of pie() shadows.

QuLogic · QuLogic · commit 3497b07ca171 · 2020-06-16T23:41:03.000-04:00
A `Shadow` already sets zorder immediately below its parent patch, so
that's no longer necessary.
diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
@@ -3076,8 +3076,7 @@ def get_next_color():
             if shadow:
                 # Make sure to add a shadow after the call to add_patch so the
                 # figure and transform props will be set.
-                shad = mpatches.Shadow(w, -0.02, -0.02)
-                shad.set(zorder=0.9 * w.get_zorder(), label='_nolegend_')
+                shad = mpatches.Shadow(w, -0.02, -0.02, label='_nolegend_')
                 self.add_patch(shad)
 
             if labeldistance is not None:
