Configure Zeal to disable hardware acceleration

[sanel]

In some cases, Zeal will render documents with artifacts, which are then removed after moving mouse over Zeal window. The reason for this could be due to bad graphic drivers, but I didn't noticed this problem in any other Qt apps, except Zeal (screenshots are below).

After setting one of these environment variables:

QMLSCENE_DEVICE=software
# or 
QT_QUICK_BACKEND=software

from [1], they disappear. However, I can't set this globally, because programs like Zoom won't show videos/cameras from other participants; I assume it will use OpenGL exclusively for rendering videos. Is there any chance we can have this as an option in configuration?

I haven't noticed this while Zeal was using previous Qt version.

[1] https://doc.qt.io/qt-5/qtquick-visualcanvas-adaptations.html#switch-between-adaptations-in-your-application

[daizhirui]

I added QMLSCENE_DEVICE=software to the desktop entry, which solved the problem.

[trollixx]

Zeal doesn't use QML/Qt Quick at all, need to find a better switch.