wxGUI/mapswipe: fix zooming box

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@54976 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/mapswipe/frame.py

@@ -105,6 +105,7 @@ class SwipeMapFrame(DoubleMapFrame):
         Only for mirror mode.
         """
         if self._mode == 'swipe':
+            event.Skip()
             return
         coords = event.GetPosition()
         if showInFirst: