fix: horizontal scroll when shift modifier is pressed #1513
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Issue:
Both Scroll and Shift+Scroll resulted in vertical(up-down) scrolling in QT5.
It seems the else(QT5) condition properly handle the shift+scroll condition, ref: https://github.com/ardiya/labelme/blob/57fbf2b9a749cd77ac5f03f005ee6206d671ece8/labelme/widgets/canvas.py#L928-L929 So I just need to handle the QT5 condition.
Expected result:
In Qt5, the Shift+Scroll should result in horizontal(left-right) scroll.
Proposed Fix: This PR
When Shift modifier is pressed, use the y dimension of the scroll and use it to scroll horizontally.
Tested with shift and without shift, the code changes produces expected behavior.