Call update() only once in PolygonSelector.clear()

Author: lschr

lib/matplotlib/widgets.py

@@ -4141,8 +4141,9 @@ def _on_key_release(self, event):
             self._remove_box()
             self.set_visible(True)
 
-    def _draw_polygon(self):
-        """Redraw the polygon based on the new vertex positions."""
+    def _draw_polygon_without_update(self):
+        """Redraw the polygon based on the new vertex positions, no update().
+        """
         xs, ys = zip(*self._xys) if self._xys else ([], [])
         self._selection_artist.set_data(xs, ys)
         self._update_box()
@@ -4155,6 +4156,10 @@ def _draw_polygon(self):
             self._polygon_handles.set_data(xs[:-1], ys[:-1])
         else:
             self._polygon_handles.set_data(xs, ys)
+
+    def _draw_polygon(self):
+        """Redraw the polygon based on the new vertex positions."""
+        self._draw_polygon_without_update()
         self.update()
 
     @property
@@ -4177,11 +4182,10 @@ def verts(self, xys):
             self._add_box()
         self._draw_polygon()
 
-    def clear(self):
-        super().clear()
+    def _clear_without_update(self):
+        self._selection_completed = False
         self._xys = [(0, 0)]
-        self.set_visible(True)
-        self._draw_polygon()
+        self._draw_polygon_without_update()
 
 
 class Lasso(AxesWidget):