https://bugs.kde.org/show_bug.cgi?id=498553

            Bug ID: 498553
           Summary: Windows get resized when turning on multiple monitors
    Classification: Plasma
           Product: kwin
           Version: git-stable-Plasma/6.2
          Platform: NixOS
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: multi-screen
          Assignee: kwin-bugs-n...@kde.org
          Reporter: arne.kel...@posteo.de
  Target Milestone: ---

SUMMARY
Some windows get resized when turning on all monitors after leaving both
monitors off for some time.

STEPS TO REPRODUCE
1. Connect two monitors via DP (secondary) and HDMI (primary)
2. Start a Qt app (e.g. KeePassXC) and a GTK app (e.g. Firefox / Thunderbird)
3. Turn off both monitors
4. Wait
5. Turn on both monitors

OBSERVED RESULT
KeePassXC is resized. Usually smaller than before.
Firefox, Thunderbird keep previous size.

EXPECTED RESULT
All windows keep their size.

WORKAROUND
Use a KWin script to resize windows to their expected size.

SOFTWARE/OS VERSIONS
Operating System: NixOS 24.11
KDE Plasma Version: 6.2.5
KDE Frameworks Version: 6.8.0
Qt Version: 6.8.0
Kernel Version: 6.6.69 (64-bit)
Graphics Platform: X11
Graphics Processor: AMD Radeon RX 5600 XT
Manufacturer: Micro-Star International Co., Ltd.
Product Name: MS-7C37
System Version: 3.0

ADDITIONAL INFORMATION
Related KDE Discuss thread:
https://discuss.kde.org/t/some-windows-resize-when-i-turn-on-off-a-second-monitor/25220

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