Adding a second kbindicator breaks it's function

[stefonarch]

Stumpled upon this playing with the flags, usually nobody would want to add 2 of them I think. Anyway, it's possible and breaks itself.

Expected Behavior

Only one kbindicator should be allowed.

Current Behavior

It's possibile to add more than one and doing so the shortcut is broken, and only the last added works clicking the icon.

Possible Solution

Make it similar to tray or taskbar: only one item allowed.

• Distribution & Version: git checkout, arch; same on debian 10