Bug#986821: freecad: Garbled menu makes freecad unusable

[Werner Mayer]

Hi tobi,

> It is still garbled when running it with QT_SCALE_FACTOR=0.9
Setting a value < 1 doesn't only cause problems with FreeCAD but with
other Qt applications, too.

For example, Qt Designer's user interface is completely garbled, not
only the menus. For other Qt based applications (assistant, linguist,
cmake-gui, vlc) it doesn't look much better.

So, there are two causes to get a garbled user interface:

* Changing the DPI value of the system. This is fixed with the
suggestion of my last mail.
Alternatively, this can be tested by setting the environment variable
QT_FONT_DPI (e.g. QT_FONT_DPI=80)

* Setting a value < 1 for QT_SCALE_FACTOR. This is not specific to
FreeCAD but is a general Qt issue that affects many other applications.

BR,
Werner
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