HiDPI support master thread

[vanuan]

Don't want to continue the discussion in the cursor + HiDPI thread. https://forum.freecadweb.org/viewtopic. ... 9&start=40

ITT let's gather all the issues and solutions WRT HiDPI support in general. By HiDPI support here I mean the scaling factor (device pixel ratio) you can set in the OS display settings: 125%, 150%, 175%, 200%, 300%, 400%.

Wiki page: https://wiki.freecadweb.org/HiDPI_support

[vanuan]

The most difficult issue right now is the 3D view.

Orbit style doesn't work correctly, selection points are too small and lines, in general, are pixelated and small