[kde] [Bug 467207] New: Fonts become garbled in GTK apps

[David]

https://bugs.kde.org/show_bug.cgi?id=467207

            Bug ID: 467207
           Summary: Fonts become garbled in GTK apps
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: david.cortes.rivera at gmail.com
  Target Milestone: ---

Created attachment 157191
  --> https://bugs.kde.org/attachment.cgi?id=157191&action=edit
garbled_fonts

SUMMARY
When using GTK apps like VScode or Vivaldi, the fonts in some places will
become garbled at random times (see screenshot for an example in VScode,
particularly the part where it's supposed to say "C/C++").

For VScode, this mostly affects the text shown when one clicks on "Settings".
Other places like the editor do not suffer from this problem.

For Vivaldi, this affects the names of tabs, but doesn't seem to affect
anything else. Happens way more frequently and the garbling is way more
noticeable in Vivaldi than in VScode.

I suppose it might be related to this other bug:
https://bugs.kde.org/show_bug.cgi?id=464824

STEPS TO REPRODUCE (Vivaldi)
1. Launch Vivaldi.
2. Open many websites in many tabs.
3. Browse some website as usual.
4. Look at the tab bar.

STEPS TO REPRODUCE (VScode)
1. Launch VScode.
2. Click the settings icon at the bottom-right corner in the side panel.
3. Select "Settings" in the pop-up that opens.
4. Search for something in the settings, such as "cwd" or "path".
5. Watch the panel at the left that shows the categories of settings.

OBSERVED RESULT
After a while, fonts in the tab bar become garbled in Vivaldi, and fonts in the
settings left panel become garbled in VScode. They fix themselves when making
the tab active or passing the mouse over them.

EXPECTED RESULT
Fonts should remain well rendered.

SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux 12
KDE Plasma Version: 5.27.2
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
Kernel Version: 6.1.0-6-amd64 (64-bit)
Graphics Platform: X11
Processors: 20 × 12th Gen Intel® Core™ i7-12700H
Memory: 62.5 GiB of RAM
Graphics Processor: Mesa Intel® Graphics
Manufacturer: SLIMBOOK
Product Name: Executive

ADDITIONAL INFORMATION

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