Bug 478517

Summary:	Unresponsive app when notification arrives whilst browsing applications in Alt+Tab
Product:	[Plasma] kwin	Reporter:	Pedro Boschi <boschi>
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	nate, plasma-bugs-null
Priority:	NOR
Version First Reported In:	5.27.10
Target Milestone:	---
Platform:	openSUSE
OS:	Linux
See Also:	https://bugs.kde.org/show_bug.cgi?id=483902
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	Example of the notification window

Description Pedro Boschi 2023-12-14 17:31:23 UTC

SUMMARY
When browsing open applications within Alt+Tab (Alt kept pressed) and a pop-up notification is received the focused application at the moment becomes the "selected" one, however it is unresponsive and the desktop shows only the background wallpaper instead of the other applications. Alt+Tab does not work again, so I need to select another open application in the taskbar for things to "go back to normal".

STEPS TO REPRODUCE
1. Hold left 'Alt' key
2. Tap 'Tab' key to cycle through the open applications
3. Wait for a notification to pop-up (from another app, such as new message received from Slack, neext music starts playing in Spotify, some browser notification, etc.)

OBSERVED RESULT
The focused application at the moment becomes the "selected" one, however it is unresponsive and the desktop shows only the background wallpaper instead of the other applications. Alt+Tab does not work again, until another open application is selected from the taskbar, then the unresponsive application also goes back to normal.

EXPECTED RESULT
Notification pop-up to be kept in the background, Alt+Tab browsing to not be disturbed and upon selecting an application, this one should just gain focus.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: OpenSUSE Tumbleweed 20231212
KDE Plasma Version: 5.27.10
KDE Frameworks Version: 5.112.0
Qt Version: 5.15.11
Kernel Version: 6.6.6-1-default (64-bit)
Graphics Platform: X11 (but the error can be reproduced in Wayland too)

ADDITIONAL INFORMATION
Dual monitor setup.
Extended screen, secondary screen placed on top of primary one.

Comment 1 Nate Graham 2023-12-15 22:39:50 UTC

Cannot reproduce in Plasma 6 Wayland with a dual monitor setup like yours and a notification sent with `sleep 3 && notify-send foo bar` Are you able to reproduce the issue with a notification sent like that? If so, I feel fairly confident in saying that the issue is already fixed in Plasma 6. :)

Comment 2 Pedro Boschi 2023-12-18 14:06:50 UTC

I could not reproduce the error with the `sleep 3 && notify-send foo bar`  approach, but I just experienced it again after receiving a notification from a Slack message arriving...

Comment 3 Nate Graham 2023-12-20 20:19:03 UTC

Does it always happen when a notification from any of the mentioned apps appears while the Alt+Tab window is open? Or only some of the time?

Comment 4 Pedro Boschi 2023-12-20 20:51:58 UTC

Created attachment 164328 [details]
Example of the notification window

This is an example of a message window that causes the bug to happen. It shows an icon and also the "notification configuration" option next to the "close" icon, both of these not present on the notification generated by the `notify-send`

Comment 5 Bug Janitor Service 2024-01-04 03:46:16 UTC

Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!

Comment 6 Bug Janitor Service 2024-01-19 03:45:40 UTC

This bug has been in NEEDSINFO status with no change for at least
30 days. The bug is now closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

Thank you for helping us make KDE software even better for everyone!