Fix Button widget motion callback.

QuLogic · QuLogic · commit 01afbdaf9d99 · 2020-04-14T00:34:17.000-04:00
diff --git a/lib/matplotlib/widgets.py b/lib/matplotlib/widgets.py
@@ -212,13 +212,9 @@ def _release(self, event):
     def _motion(self, event):
         if self.ignore(event):
             return
-        if event.inaxes == self.ax:
-            c = self.hovercolor
-        else:
-            c = self.color
-        if c != self._lastcolor:
+        c = self.hovercolor if event.inaxes == self.ax else self.color
+        if c != self.ax.get_facecolor():
             self.ax.set_facecolor(c)
-            self._lastcolor = c
             if self.drawon:
                 self.ax.figure.canvas.draw()
 
