Merge pull request #6124 from PrimozGodec/midbutton

[FIX] plotutils - replace MidButton with MiddleButton

Author: janezd

Orange/widgets/visualize/utils/plotutils.py

@@ -244,7 +244,7 @@ def zoom():
             # uses mapRectFromParent. We don't want to copy the parts of the
             # method that work, hence we only use our code under the following
             # conditions.
-            if ev.button() & (Qt.LeftButton | Qt.MidButton) \
+            if ev.button() & (Qt.LeftButton | Qt.MiddleButton) \
                     and self.state['mouseMode'] == pg.ViewBox.RectMode \
                     and ev.isFinish():
                 zoom()