Bug#987642: QT Scaling

[Sam Lander]

Hi all

I came across this combination in
https://tracker.freecadweb.org/view.php?id=4351

export QT_SCALE_FACTOR=1
export QT_AUTO_SCREEN_SCALE_FACTOR=0
Applying those two variables makes the debian packaged FreeCAD work just
fine.

I tried QT_SCALE_FACTOR in a scattergun fashion between 0.1 and 2.0.
Anything less than 1.0 caused garbled menus, anything higher than 1 makes
it work just fine, but the menu texts get huge.

Here is a QT pointer to the same problem:
https://forum.qt.io/topic/110033/qmenu-and-qt_scale_factor
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