SUMMARY Running on Kubuntu unstable CI, as of about two weeks ago, the CTRL+` (Key_QuoteLeft) cannot be assigned to any global shortcut. When trying to assign it, it appears to be set correctly but when invoked - the specified function does not activate and instead a notification pop up shows up with the last desktop notification. STEPS TO REPRODUCE 1. open the Global Shortcuts configuration dialog 2. Select some function and configure it to be triggered on CTRL+` 3. Press CTRL+` OBSERVED RESULT A KNotifications popup appears showing the last notification displayed and possible a timer showing how much time has passed since the notification was originally displayed. Additional triggering of the shortcut shows additional notifications up to 4. EXPECTED RESULT The configured global accelerator should have triggered the specified function. SOFTWARE/OS VERSIONS Linux/KDE Plasma: KDE Plasma Version: 5.15.80 KDE Frameworks Version: 5.58 Qt Version: 5.12.2 ADDITIONAL INFORMATION I don't know what component takes over this shortcut, and without involving kglobalaccel - as I didn't find any configuration in the global shortcuts dialog that uses CTRL+`, nor did I get a conflict notification when I try to set it up, so I'm posting this to kglobalaccel as an act of desperation ;-) I've reviewed KNotifications source code and I don't think it is responsible for this.
I found the problem and it is not KDE. The problem is caused by dunst (https://dunst-project.org/) which I installed at some point and forgot about it. It's been installed a while so I'm not sure why I started noticing this in the last two weeks - it was updated to 1.3 at the end of April, but the release notes for 1.3 do not have anything relevant. Anyway, the fix is to disable or reconfigure dunst.