[kmail2] [Bug 488324] New: Fractional scaling of mail view window looks badly scaled

[Bernd Paysan]

https://bugs.kde.org/show_bug.cgi?id=488324

            Bug ID: 488324
           Summary: Fractional scaling of mail view window looks badly
                    scaled
    Classification: Applications
           Product: kmail2
           Version: 6.0.2
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: message list
          Assignee: kdepim-bugs at kde.org
          Reporter: bernd.paysan at gmx.de
  Target Milestone: ---

Created attachment 170358
  --> https://bugs.kde.org/attachment.cgi?id=170358&action=edit
Screenshot of Kmail message viewer

SUMMARY

I've set my screen to 165% fractional scaling for this test; it looks similar
with 150% or any other reasonable fractional scaling. While the rest of KMail
or Kontact looks pixel by pixel as it should be, the mail view window looks
badly scaled, not even blurred, but pixels getting twice as large.

STEPS TO REPRODUCE
1. Use Wayland and set main screen to fractional scale 150%
2. Open KMail or Kontact to look at a test mail (HTML or plaintext)

OBSERVED RESULT
Badly scaled text, where individual strokes have different size (look e.g. at
an “m”).

EXPECTED RESULT
Well rendered text, see the menu for comparison

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Kontact 6.0.2 (24.02.2)
(available in About System)
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.2.0
Qt Version: 6.7.1

ADDITIONAL INFORMATION
I'm looking through KDE which parts are not working well on a fractional scaled
output, and this is one of the few cases I found. For the components, it is a
subcomponent of the message list, which otherwise is fine.

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