[kde] [Bug 486039] New: [wayland] Some Applications Render Fonts with Artifacting at Certain Window/Element Widths at Fractional Scale Factors

[Eamonn Rea]

https://bugs.kde.org/show_bug.cgi?id=486039

            Bug ID: 486039
           Summary: [wayland] Some Applications Render Fonts with
                    Artifacting at Certain Window/Element Widths at
                    Fractional Scale Factors
    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: eamonnrea at protonmail.com
  Target Milestone: ---

Created attachment 168847
  --> https://bugs.kde.org/attachment.cgi?id=168847&action=edit
Discover Font Rendering

SUMMARY
Some text is rendered with unusual artifacting at certain window sizes when
using fractional scaling. The width/position of the containing element is also
likely to play a role.

When resizing the window, the text will jump around a little bit to the sides
as it goes between being artifacted and rendering correctly. However, if you
resize the window and get one part of the application to look correct, other
parts will not look correct, causing a constant game of cat-and-mouse. I have
not yet found a window size that renders correctly.

On a display without fractional scaling, text renders correctly.

This affects the following software:
- Discover
- NeoChat (resizing doesn't always help in the case of the "About KDE" section,
where the text is always rendered with artifacts).
- Kasts (probably the least impacted except for one case that I will attach a
screenshot of)
- Application Dashboard
- Info Center, to a minimal degree

These issues are usually most visible on the "About" page.

I filed this under "I don't know" because this only affects some (QML?)
applications. Some applications, like Dolphin, are entirely unaffected.


STEPS TO REPRODUCE
For this example, I will use Discover.
1. Open Discover and go to the About page, with a scale factor of 150%
2. If not observe the issue, resize slowly until observed. 
3. Text will jump around to the sides by a few pixels while resizing.


OBSERVED RESULT
Some applications will render fonts ugly at 150% scaling.


EXPECTED RESULT
All applications render fonts cleanly regardless of scale factor.


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 6.8.7 Linux Zen
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.1.0
Qt Version: 6.7.0

ADDITIONAL INFORMATION
On my system I am using the "Inter Display" font set to Medium 10pt, but this
also affects Noto.

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