[dolphin] [Bug 486036] New: Blurry folder/file icons with 22px zoom and fractional display scale in Dolphin

[Pavel Dobiáš]

https://bugs.kde.org/show_bug.cgi?id=486036

            Bug ID: 486036
           Summary: Blurry folder/file icons with 22px zoom and fractional
                    display scale in Dolphin
    Classification: Applications
           Product: dolphin
           Version: 24.02.1
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: view-engine: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: pavel23dob at proton.me
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 168846
  --> https://bugs.kde.org/attachment.cgi?id=168846&action=edit
Screenshot of Dolphin capturing the issue.

SUMMARY
Using Dolphin with any view mode and fractional display scale (125% or 175%)
renders folder and file icons blurry in the general view. It specifically
affects the file/folder view and doesn't affect other icons, like those in
places sidebar.

STEPS TO REPRODUCE
1. Make sure to use Wayland and have 125% or 175% display scale.
2. Open dolphin.
3. Set zoom to 22px.
4. Observe blurry icons in the general file/folder view.

OBSERVED RESULT
Icons for folders and files in the file/folder view render blurred. You can
easily compare them with the places sidebar right next to the view, by setting
the icons in places sidebar to 22px as well. Also changing to non-fractional
display scale, like 150%, can make the difference clear.

EXPECTED RESULT
Icons render without blur, just like they should.

SOFTWARE/OS VERSIONS
Windows: N/A
macOS: N/A
Linux/KDE Plasma: Fedora 40
(available in About System)
KDE Plasma Version: 6.0.3
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2

ADDITIONAL INFORMATION
- You can directly compare the icons in my provided screenshot (places sidebar
vs general view).
- I currently use Fedora Linux, but OpenSUSE Tumbleweed w/ KDE Plasma also had
the issue last time I used it.

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