[kde] [Bug 479891] Some text glyphs in QML software are mis-aligned or squished when using a fractional scale factor

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https://bugs.kde.org/show_bug.cgi?id=479891

gilles at gagniard.org changed:

           What    |Removed                     |Added
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                 CC|                            |gilles at gagniard.org

--- Comment #35 from gilles at gagniard.org ---
Created attachment 170663
  --> https://bugs.kde.org/attachment.cgi?id=170663&action=edit
Screenshot of Konsole toolbar on X11, 150% fractional scaling, Qt rounding
policy set

I can confirm that setting QT_SCALE_FACTOR_ROUNDING_POLICY to RoundPreferFloor
indeed fixes the bad glyph rendering, however it also seems to disable
fractional scaling on X11 for all graphical elements (fonts seem to still be
properly scaled though ?), for instances icons are either scaled to 2x or to 1x
depending on the ratio.

In the attached screenshot, the icons are too small compared to the text with
150% scaling factor. With scaling factors <=150%, it also makes plasma panels
to be sized at 1x (but with text scaled at 150% !).

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