Bug 490140

Summary:	On X11, pressing alt+shift+r isn't registered in Konsole or Tastenbrett
Product:	[Plasma] kwin	Reporter:	zyf0330 <zyf034100>
Component:	input	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED NOT A BUG
Severity:	normal	CC:	cwo.kde, zyf034100
Priority:	NOR
Version:	5.27.11
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:
Attachments:	Situation In terminal Situation In Keyboard layout viewer

Description zyf0330 2024-07-12 03:10:03 UTC

***
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***

SUMMARY
Recently, I find that alt+shift+r shortcut doesn't work anymore. In the Keyboard layout viewer, alt+shift+r doesn't active corresponding button. 
In the tty which I switch into by press ctrl+alt+F3, alt+shift+r works which outputs "^[R".

STEPS TO REPRODUCE
1. boot into KDE desktop
2. alt+shift+r doesn't work
3. 

OBSERVED RESULT
Nothing happened when press.

EXPECTED RESULT
Keyboard layout viewer reacts.

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: 24.04
(available in About System)
KDE Plasma Version: 5.27.11
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.13

ADDITIONAL INFORMATION
I notice that after press alt+shift+r in the System Settings window like Keyboard, UI elements blink like they are refreshed.

Comment 1 zyf0330 2024-07-12 06:36:33 UTC

Created attachment 171596 [details]
Situation In terminal

Comment 2 zyf0330 2024-07-12 06:36:57 UTC

Created attachment 171597 [details]
Situation In Keyboard layout viewer

Comment 3 zyf0330 2024-07-18 08:57:19 UTC

I try it on Wayland, and this problem doesn't appear.

Comment 4 cwo 2024-09-13 11:53:58 UTC

Do you have a global shortcut set for Alt+Shift+R, or an application that listens for this shortcut running? If another application grabs this combination, it will not be sent to the application that has focus.

Comment 5 zyf0330 2024-09-14 01:54:10 UTC

(In reply to cwo from comment #4)
> Do you have a global shortcut set for Alt+Shift+R, or an application that
> listens for this shortcut running? If another application grabs this
> combination, it will not be sent to the application that has focus.

Hi.
I have inspected System Settings Shortcuts and Custom Shortcuts, and there is no alt+shift+r shortcut binding.
I don't think any application listens for this shortcut too, but how to troubleshoot it?

Comment 6 zyf0330 2024-09-14 07:35:02 UTC

Hello, thanks for your prompt, I have find the app grabbing this shortcut.
And after learning Xlib development, I know that how to grab shortcut globally.
But I must use that app, and I want to know how to prevent that app to do that.  I tried XUngrabKey within myself program, it doesn't work.
Can you help me?

Comment 7 cwo 2024-09-14 08:13:50 UTC

(In reply to zyf0330 from comment #6)
> But I must use that app, and I want to know how to prevent that app to do
> that.  I tried XUngrabKey within myself program, it doesn't work.
> Can you help me?

I'm sorry, I don't know much about the internals here.

I would recommend

- seeing whether you can configure the application to not grab that particular shortcut somewhere in the app's settings or cofiguration files
- if you have source code access, remove the key grab for that combination and recompile
- ask in a general support forum for linux/your distribution/X11, where more people may see it compared to a bug on a tracker somewhere
- consider switching to Wayland (if your hardware supports that), where you can turn off the ability for X11 apps to grab input this way

Comment 8 zyf0330 2024-09-14 08:56:30 UTC

Thanks

Comment 9 zyf0330 2024-09-14 09:18:50 UTC

I find a common solution.
I write a program to occupy shortcut globally before that app starts, and exit after it starts.
That app is Feishu.
https://github.com/zyf0330/listen-key-press