Implement remove_rubberband rather than release_zoom.

... in backends that didn't do so yet.  release_zoom itself calls
remove_rubberband, so implementing remove_rubberband it more general
(it allows one to directly call it independently of zoom state).

Author: anntzer

lib/matplotlib/backends/_backend_tk.py

@@ -611,15 +611,13 @@ def set_message(self, s):
         self.message.set(s)
 
     def draw_rubberband(self, event, x0, y0, x1, y1):
+        self.remove_rubberband()
         height = self.canvas.figure.bbox.height
         y0 = height - y0
         y1 = height - y1
-        if hasattr(self, "lastrect"):
-            self.canvas._tkcanvas.delete(self.lastrect)
         self.lastrect = self.canvas._tkcanvas.create_rectangle(x0, y0, x1, y1)
 
-    def release_zoom(self, event):
-        super().release_zoom(event)
+    def remove_rubberband(self):
         if hasattr(self, "lastrect"):
             self.canvas._tkcanvas.delete(self.lastrect)
             del self.lastrect
@@ -780,11 +778,10 @@ def hidetip(self):
 
 class RubberbandTk(backend_tools.RubberbandBase):
     def draw_rubberband(self, x0, y0, x1, y1):
+        self.remove_rubberband()
         height = self.figure.canvas.figure.bbox.height
         y0 = height - y0
         y1 = height - y1
-        if hasattr(self, "lastrect"):
-            self.figure.canvas._tkcanvas.delete(self.lastrect)
         self.lastrect = self.figure.canvas._tkcanvas.create_rectangle(
             x0, y0, x1, y1)
 

lib/matplotlib/backends/backend_macosx.py

@@ -108,8 +108,7 @@ def __init__(self, canvas):
     def draw_rubberband(self, event, x0, y0, x1, y1):
         self.canvas.set_rubberband(int(x0), int(y0), int(x1), int(y1))
 
-    def release_zoom(self, event):
-        super().release_zoom(event)
+    def remove_rubberband(self):
         self.canvas.remove_rubberband()
 
     def save_figure(self, *args):

lib/matplotlib/backends/backend_webagg_core.py

@@ -388,13 +388,10 @@ def set_message(self, message):
         self.message = message
 
     def draw_rubberband(self, event, x0, y0, x1, y1):
-        self.canvas.send_event(
-            "rubberband", x0=x0, y0=y0, x1=x1, y1=y1)
+        self.canvas.send_event("rubberband", x0=x0, y0=y0, x1=x1, y1=y1)
 
-    def release_zoom(self, event):
-        super().release_zoom(event)
-        self.canvas.send_event(
-            "rubberband", x0=-1, y0=-1, x1=-1, y1=-1)
+    def remove_rubberband(self):
+        self.canvas.send_event("rubberband", x0=-1, y0=-1, x1=-1, y1=-1)
 
     def save_figure(self, *args):
         """Save the current figure"""