@@ -679,7 +679,7 @@ class ZoomToAnimation(MoveToAnimation):

         visible = min(rect.width, rect.height) * .9

         if distance > visible:

             desired_middle_zoom = visible / distance

-            self.extra_zoom = 4 * (desired_middle_zoom - middle_zoom)

+            self.extra_zoom = min(0, 4 * (desired_middle_zoom - middle_zoom))

     def animate(self, t):

         a, b, c = self.source_zoom, self.extra_zoom, self.target_zoom