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preview failure on very old processoes in WINDOWS11
I have 4 'old' computers all updated to Windows 11.
2013: Intel core i7-2600
2011: Intel core i5-2450M
2009: Intel core 2 duo P8600
2007: Intel core 2 duo E7300
On the two "less old" PC's the Preview window of Sigil 2.4.2 works fine. However on the two oldest the Preview window refuses to function in sigil 2.4.2: only a flash and after that the preview window stays blank. After uninstalling version 2.4.2 and reinstalling Sigil 2.2.0 the Preview window was working again. No need to set environment variables named QSG_RHI_BACKEND and/or QT_OPENGL and no need to "Disable GPU Acceleration in QtWebEngine/Preview"in settings.
It seems that the combination of windows 11 and the very old processors prevent the Preview window to work in the most recent versions of Sigil
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