Bug 514225

Summary:	Regression: Maximized screens do not change geometry on display change without window decorations
Product:	[Plasma] kwin	Reporter:	Erik Quaeghebeur <bugs.kde.org>
Component:	multi-screen	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	REPORTED ---
Severity:	normal
Priority:	NOR
Version First Reported In:	6.5.4
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Erik Quaeghebeur 2026-01-06 14:04:35 UTC

SUMMARY
I often maximize windows and then toggle their decorations off (F10 shortcut). When changing displays (external → laptop → external), those windows keep their size and so do not remain maximized. Windows with decorations do stay maximized, i.e., change their size to adapt to what maximal means on the new display.

STEPS TO REPRODUCE
1. Open window, maximize, F10
2. Change primary display

OBSERVED RESULT
Window not maximized, keeps size

EXPECTED RESULT
Window remains maximized, size adapted

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
KDE Plasma Version: 6.5.4
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.1