fix detection of which artist(s) the mouse is over

megies · megies · commit 57e0f0ac673c · 2018-02-01T11:03:03.000+01:00
since Artist.contains() returns a tuple it is not usable like
"if my_artist.contains(): do something"
diff --git a/lib/matplotlib/backend_bases.py b/lib/matplotlib/backend_bases.py
@@ -2890,7 +2890,7 @@ def mouse_move(self, event):
                 pass
             else:
                 artists = [a for a in event.inaxes.mouseover_set
-                           if a.contains(event) and a.get_visible()]
+                           if a.contains(event)[0] and a.get_visible()]
 
                 if artists:
                     a = cbook._topmost_artist(artists)
