Bug 481331

Summary:	Dragging a window on screen 1 to screen 2 actually moves it to a different virtual desktop
Product:	[Plasma] kwin	Reporter:	Nate Graham <nate>
Component:	effects-overview	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED FIXED
Severity:	major	CC:	dashonwwIII, fanzhuyifan
Priority:	NOR	Keywords:	qt6
Version First Reported In:	master
Target Milestone:	---
Platform:	Other
OS:	Linux
See Also:	https://bugs.kde.org/show_bug.cgi?id=481336 https://bugs.kde.org/show_bug.cgi?id=481868
Latest Commit:	https://invent.kde.org/plasma/kwin/-/commit/e4443c32b3ed8a027a103005594d7a2ea8927d79	Version Fixed In:
Sentry Crash Report:

Description Nate Graham 2024-02-14 17:39:07 UTC

STEPS TO REPRODUCE
1. Have two screens
2. Have at least two virtual desktops arranged in a horizontal line
3. Be in the first virtual desktop
4. Open Dolphin on screen 1
5. Activate Overview
6. Drag the Dolphin window visible on screen 1's WindowHeap over to WindowHeap of the Overview on Screen 2. Do NOT drag it to another virtual desktop on screen 2.


OBSERVED RESULT
The Dolphin window moves over to screen 2 in Overview, but it fails to shrink properly and fit in among the other windows on the WindowHeap on screen 2. In addition, the window is actually moved to virtual desktop #2. As a result when you close the Overview effect the window has disappeared (because it's actually on another virtual desktop). A novice user may think the window has disappeared and panic.


EXPECTED RESULT
The Dolphin window moves to the other screen, not a different virtual desktop


ADDITIONAL INFORMATION
If I have only one virtual desktop, everything works properly.

Comment 1 fanzhuyifan 2024-02-14 19:23:38 UTC

Can reproduce -- this only happens in overview, not in gridview.

Comment 2 David Edmundson 2024-02-19 15:08:44 UTC

Git commit 6190bfc58fb7283a020e4e982e26e2be8e2e85eb by David Edmundson.
Committed on 19/02/2024 at 15:08.
Pushed by davidedmundson into branch 'desktop_drag'.

overview: Only handled input events in on-screen desktops

kwin does not support true multiscreen drag and drops. Events are sent
to an offscreen location of the screen initiating the drag. Therefore it
is important that off-screen items do not process drop events

M  +3    -0    src/plugins/overview/qml/main.qml

https://invent.kde.org/plasma/kwin/-/commit/6190bfc58fb7283a020e4e982e26e2be8e2e85eb

Comment 3 Vlad Zahorodnii 2024-02-19 15:40:41 UTC

Git commit 3ede995b270bd85610422eea36bfe9139b3b5107 by Vlad Zahorodnii, on behalf of David Edmundson.
Committed on 19/02/2024 at 15:28.
Pushed by vladz into branch 'master'.

overview: Only handled input events in on-screen desktops

kwin does not support true multiscreen drag and drops. Events are sent
to an offscreen location of the screen initiating the drag. Therefore it
is important that off-screen items do not process drop events

M  +5    -0    src/plugins/overview/qml/main.qml

https://invent.kde.org/plasma/kwin/-/commit/3ede995b270bd85610422eea36bfe9139b3b5107

Comment 4 Vlad Zahorodnii 2024-02-19 15:51:11 UTC

Git commit e4443c32b3ed8a027a103005594d7a2ea8927d79 by Vlad Zahorodnii, on behalf of David Edmundson.
Committed on 19/02/2024 at 15:42.
Pushed by vladz into branch 'Plasma/6.0'.

overview: Only handled input events in on-screen desktops

kwin does not support true multiscreen drag and drops. Events are sent
to an offscreen location of the screen initiating the drag. Therefore it
is important that off-screen items do not process drop events


(cherry picked from commit 3ede995b270bd85610422eea36bfe9139b3b5107)

M  +5    -0    src/plugins/overview/qml/main.qml

https://invent.kde.org/plasma/kwin/-/commit/e4443c32b3ed8a027a103005594d7a2ea8927d79

Comment 5 David Edmundson 2024-02-22 14:15:15 UTC

*** Bug 478132 has been marked as a duplicate of this bug. ***