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After looking at the new qt environment vars that come into play with fractional scaling, could it be that the rounding policy (none, up,ceil, floor, 75% level) is causing the issue as font ascents, descents, and spacing might underfow or overflow depending on the active rounding policy?
Very strange that PageEdit is okay with woff fonts, with fractional dpi with directwrite, unless it somehow defaulted to the gdi backend?
I am not sure where in the Windows font related code that the font engine to use is determined.
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