Bug 478382

Summary:	Window stacking issues when lowering a transient window or a window with transients
Product:	[Plasma] kwin	Reporter:	Jarek Janik <ann.of.the.green.gables>
Component:	core	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal	CC:	kde, nate
Priority:	NOR	Keywords:	qt6
Version:	git master
Target Milestone:	---
Platform:	Neon
OS:	Linux
Latest Commit:	https://invent.kde.org/plasma/kwin/-/commit/dc3e489472431789ded4ad5b9ab36c466118d5df	Version Fixed In:	6.3.3
Sentry Crash Report:

Description Jarek Janik 2023-12-11 03:02:11 UTC

There are two window stacking related issues when lowering a window:
* when lowering a window that is a parent of a window hierarchy only this window gets lowered - leaving rest of hierarchy  "dangling"
* when lowering a transient that is a part of something more complicated then just parent + single child - the whole hierarchy gets lowered as expected, but that window itself is promoted to the top of such hierarchy

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
KDE Plasma Version: 5.81.80
KDE Frameworks Version: 5.245.0
Qt Version: 6.6.0

Comment 1 Jarek Janik 2023-12-11 03:22:15 UTC

This is the behaviour, on wayland it is broken in another way: #478383

Comment 2 Jarek Janik 2023-12-11 03:50:07 UTC

MR with fix is here:
https://invent.kde.org/plasma/kwin/-/merge_requests/4779

Comment 3 Jarek Janik 2024-12-10 02:05:09 UTC

New MR:
https://invent.kde.org/plasma/kwin/-/merge_requests/6882

Comment 4 Zamundaaa 2025-03-07 17:29:51 UTC

Git commit 1df917fae4bc744e1508b4e95e8d9a7b521a00da by Xaver Hugl, on behalf of Jarek Janik.
Committed on 07/03/2025 at 15:08.
Pushed by zamundaaa into branch 'master'.

layers: fix stacking issues in Workspace::lowerWindow

Workspace::lowerWindow() method had issues when handling window
hierarchies (different on X11 and on wayland, see BUGS below).

This patch unifies code paths for both X11 and wayland in lowerWindow()
method, fixing the aforementioned bugs.
Related: bug 478383

M  +19   -14   src/layers.cpp

https://invent.kde.org/plasma/kwin/-/commit/1df917fae4bc744e1508b4e95e8d9a7b521a00da

Comment 5 Zamundaaa 2025-03-07 18:53:35 UTC

Git commit dc3e489472431789ded4ad5b9ab36c466118d5df by Xaver Hugl, on behalf of Jarek Janik.
Committed on 07/03/2025 at 18:15.
Pushed by zamundaaa into branch 'Plasma/6.3'.

layers: fix stacking issues in Workspace::lowerWindow

Workspace::lowerWindow() method had issues when handling window
hierarchies (different on X11 and on wayland, see BUGS below).

This patch unifies code paths for both X11 and wayland in lowerWindow()
method, fixing the aforementioned bugs.
Related: bug 478383
(cherry picked from commit 1df917fae4bc744e1508b4e95e8d9a7b521a00da)

M  +19   -14   src/layers.cpp

https://invent.kde.org/plasma/kwin/-/commit/dc3e489472431789ded4ad5b9ab36c466118d5df