[kmail2] [Bug 482445] New: kmail font rendering broken on plasma 6 and HiDPI (scaled) display

[Jeffrey Bouter]

https://bugs.kde.org/show_bug.cgi?id=482445

            Bug ID: 482445
           Summary: kmail font rendering broken on plasma 6 and HiDPI
                    (scaled) display
    Classification: Applications
           Product: kmail2
           Version: 6.0.0
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: composer
          Assignee: kdepim-bugs at kde.org
          Reporter: kde at kn0x.org
  Target Milestone: ---

Created attachment 166415
  --> https://bugs.kde.org/attachment.cgi?id=166415&action=edit
screenshot of a test email in kmail

SUMMARY

On Plasma 6, font rendering is broken when reading emails using kmail on a
scaled (hidpi) display. Please see attached screenshot for a beautiful preview.

All other components of kmail scale and render fine.

STEPS TO REPRODUCE
1. Use wayland (not tested on X11)
2. Configure display scaling (only tested on 125% and 150%)
3. Open an email in kmail. Both HTML and text format are affected

OBSERVED RESULT

Blurred, unhinted fonts

EXPECTED RESULT

Clean, well rendered and hinted fonts.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: KDE Neon 22.04
(available in About System)
KDE Plasma Version: 6.0.0
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2

ADDITIONAL INFORMATION

Graphics platform: Wayland
kmail version: 6.0.0 (24.02.0)

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