[kde] [Bug 471443] New: Low-res Images in Qt Apps when using fractional scaling

[Max Staff]

https://bugs.kde.org/show_bug.cgi?id=471443

            Bug ID: 471443
           Summary: Low-res Images in Qt Apps when using fractional
                    scaling
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: NixOS
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: bright.joy7094 at mstaff.dev
  Target Milestone: ---

Created attachment 159897
  --> https://bugs.kde.org/attachment.cgi?id=159897&action=edit
Current pixelated scaling

SUMMARY
***
Icons in the Telegram Desktop App are blurry or pixelated when setting the
global scaling to e.g. 150% in the display settings.
***


STEPS TO REPRODUCE
1. Set global scaling to 150% in display settings
2. reboot
3. open Telegram and closely look at any icon

OBSERVED RESULT

* rounded corners of profile pictures look pixelated
* icons and emojis look pixelated

EXPECTED RESULT
* rounded corners actually round
* high-res version of icons and emojis used

SOFTWARE/OS VERSIONS
NixOS: 23.11
KDE Plasma Version: 5.27.6
KDE Frameworks Version: 5.107.0
Qt Version: 5.15.9
Kernel-Version: 6.3.6 (64-bit)
Graphics: X11

ADDITIONAL INFORMATION
* Telegram also had display scaling set to 225% by default (in the
in-app-settings) after switching to global scaling of 150%
* Other users have also reported this to the Telegram Desktop Github issue
tracker as well as the Qt issue tracker with both saying that the issue lies
with KDE
  * some users have reported that this happens only on the official version of
Telegram for their respective distro, not on snaps
  * quote from Telegram Desktop issue tracker: "According to
https://doc.qt.io/qt-6/highdpi.html, QT_SCREEN_SCALE_FACTORS is in line with
debug-only environment variables KDE shouldn't set."

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