[okular] [Bug 512616] New: Anti-aliasing works only on display where Okular was opened

[WURMi]

https://bugs.kde.org/show_bug.cgi?id=512616

            Bug ID: 512616
           Summary: Anti-aliasing works only on display where Okular was
                    opened
    Classification: Applications
           Product: okular
      Version First 25.08.3
       Reported In:
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: wurmi at dbs.sk
  Target Milestone: ---

Created attachment 187176
  --> https://bugs.kde.org/attachment.cgi?id=187176&action=edit
example of anti-aliasing issue

SUMMARY

I have 3-display setup:

1. 1920x1200 (100% scale)
2. 2560x1440 (120% scale)
3. 1680x1050 (105% scale)
(scales ale different to preserve the same visual size of an application on all
displays)

When I open Okular and open random PDF document e.g. on second display,
everything is OK. But when I move the window to first or third display,
anti-aliasing is not applied and fonts are pixelated. When I move window back
to second display, everything is OK again.

STEPS TO REPRODUCE
1. open PDF document in Okular
2. move window to different display with different scaling


OBSERVED RESULT
font is poorly readable and pixelated

EXPECTED RESULT
font should be anti-aliased

SOFTWARE/OS VERSIONS
System: Fedora KDE 43
Kernel: Linux 6.17.7-300.fc43.x86_64
DE: KDE Plasma 6.5.2

ADDITIONAL INFORMATION
I found a workaround by changing the Zoom factor. Document is forced to redraw
and anti-aliasing is applied. Maybe this redraw function should be called even
when window is moved from one display to another to reapply the anti-aliasing

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