Bug 488175

Summary:	Screen Edge Overview not activated with specific screen layout
Product:	[Plasma] kwin	Reporter:	Paulo Constança <paulocesarsc>
Component:	Hotcorners and edges	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	CONFIRMED ---
Severity:	minor	CC:	kb01, kde, nate, notmart, openmindead
Priority:	NOR	Keywords:	multiscreen
Version First Reported In:	6.0.5
Target Milestone:	---
Platform:	Fedora RPMs
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	Screen Layout Screen Layout kB01

Description Paulo Constança 2024-06-07 18:58:54 UTC

Created attachment 170236 [details]
Screen Layout

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SUMMARY
The new overview of open applications / virtual desktops when moving the cursor to the top left screen edge will not trigger in the central / right monitor if the monitors are stacked in the following layout (check screenshot).

STEPS TO REPRODUCE
1. Move Cursor to the top left screen edge in the middle or right screen
2. The overview does not show

OBSERVED RESULT
The overview does not show


EXPECTED RESULT
The overview should show

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 40 KDE Spin - Plasma 6.0.5
(available in About System)
KDE Plasma Version: 6.0.5
KDE Frameworks Version: 6.2.0
Qt Version: 6.7.1

ADDITIONAL INFORMATION
I'm using Fedora 40 KDE Spin

Comment 1 Nate Graham 2024-06-10 19:24:47 UTC

Likely fixed in Plasma 6.1 with the new edge barrier feature, but unfortunately I don't have enough screens to be able to reproduce this screen setup so I can verify that for myself. Can you try again in Plasma 6.1? It's scheduled to be released in about a week. If you find that it's still not working there, feel free to re-open this bugzilla ticket. Thanks!

Comment 2 Paulo Constança 2024-06-20 18:56:50 UTC

@Nate Graham: This issue persists in KDE 6.1. I have played with the edge margins but to no avail. This issue can be easily reproduced if you place two monitors side by side, but the left one half-way vertically!

This also affects all corner actions monitors close to one another, as in my case i tried to set the the right corner with the same behaviour and it also doesn't work.

Comment 3 kb01 2024-09-16 14:26:40 UTC

Created attachment 173724 [details]
Screen Layout kB01

Left and Bottom Screen shows overview when Cursor is in top left Corner.
Middle Screen (top right) does not show overview when Cursor is in top left Corner.

Comment 4 kb01 2024-09-16 14:28:54 UTC

(In reply to kb01 from comment #3)
> Created attachment 173724 [details]
> Screen Layout kB01
> 
> Left and Bottom Screen shows overview when Cursor is in top left Corner.
> Middle Screen (top right) does not show overview when Cursor is in top left
> Corner.

My System is:

Operating System: NixOS 24.11
KDE Plasma Version: 6.1.4
KDE Frameworks Version: 6.5.0
Qt Version: 6.7.2
Kernel Version: 6.6.49 (64-bit)
Graphics Platform: Wayland

Comment 5 Vlad Zahorodnii 2024-09-25 12:21:24 UTC

Confirmed, currently, kwin doesn't support registering hot corners on setups like this. It works approximately like this:

- take the bounding rectangle of all outputs
- register the top-left hot corner on an output that contains the top left corner of the bounding rect