Backport PR #15857: LassoSelection shouldn't useblit on canvas not supporting blitting.

tacaswell · MeeseeksDev[bot] · commit 91f556054fb7 · 2019-12-11T00:29:46.000Z
diff --git a/lib/matplotlib/widgets.py b/lib/matplotlib/widgets.py
@@ -2455,15 +2455,12 @@ def __init__(self, ax, onselect=None, useblit=True, lineprops=None,
                  button=None):
         _SelectorWidget.__init__(self, ax, onselect, useblit=useblit,
                                  button=button)
-
         self.verts = None
-
         if lineprops is None:
             lineprops = dict()
-        if useblit:
-            lineprops['animated'] = True
+        # self.useblit may be != useblit, if the canvas doesn't support blit.
+        lineprops.update(animated=self.useblit, visible=False)
         self.line = Line2D([], [], **lineprops)
-        self.line.set_visible(False)
         self.ax.add_line(self.line)
         self.artists = [self.line]
 
