When I press Left Ctrl, my
xev output shows this:
FocusOut event, serial 37, synthetic NO, window 0x5600001, mode NotifyGrab, detail NotifyAncestor
When I press Right Ctrl, there's no FocusOut event. Why so?
When I press Enter and then Ctrl+V really fast, the Ctrl+V doesn't work (it doesn't paste anything). I narrowed down the problem using
xev. When I press Enter and then immediately Ctrl+V, the "V" isn't registered by operating system. Instead, it's stuck on Ctrl, displaying the FocusOut event. However, it works alright with Right Ctrl.
I thought that Left Ctrl shouldn't trigger FocusOut in the first place, and asked the question.