Disable sticky edge accumulation if no autoscaling.

If there's no margin to be added, we don't need sticky edges, but if
autoscaling is off, we _also_ don't need the sticky edges. This saves a
lot of time when plotting many artists, like in matplotlib#12542.

Author: QuLogic

lib/matplotlib/axes/_base.py

@@ -2403,7 +2403,9 @@ def autoscale_view(self, tight=None, scalex=True, scaley=True):
         if tight is not None:
             self._tight = bool(tight)
 
-        if self.use_sticky_edges and (self._xmargin or self._ymargin):
+        if self.use_sticky_edges and (
+                (self._xmargin and scalex and self._autoscaleXon) or
+                (self._ymargin and scaley and self._autoscaleYon)):
             stickies = [artist.sticky_edges for artist in self.get_children()]
             x_stickies = sum([sticky.x for sticky in stickies], [])
             y_stickies = sum([sticky.y for sticky in stickies], [])