Created attachment 139749 [details]
Bug details (LibreOffice Draw format)

SUMMARY
In "Configure Keyboard Shortcuts" there's no way to set any custom shortcut. I type the shortcut and it gets shown in the custom shortcut control, but it doesn't get saved no matter what I do.

STEPS TO REPRODUCE
1. Go to Settings > Configure keyboard shortcuts
2. Choose any option, f.i. Rotate left
3. Choose Custom and click the button where it's written "None"
4. Press the desired shortcut (in my case Ctrl + Shift + L)
5. The shortcut is identified by the control but it doesn't get shown where it's supposed to (see attached file); actually it keeps catching more shortcuts if I keep pressing keys
6. Click OK in the main dialog

OBSERVED RESULT
The shortcut is not saved. I tried it multiple times and all the times it gets caught duplicated.

One weird thing: if I press Enter while it's catching the shortcut, then it gets saved, but it also saves Enter as the shortcut. However, the desired shortcut does not work.

EXPECTED RESULT
The shortcut should be saved and work.

Operating System: Kubuntu 21.04
KDE Plasma Version: 5.22.2
KDE Frameworks Version: 5.83.0
Qt Version: 5.15.2
Kernel Version: 5.11.0-22-generic (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 3700X 8-Core Processor
Memory: 15,6 GiB of RAM
Graphics Processor: GeForce GTX 1660/PCIe/SSE2