Backport PR
#4183: ESC should be handled by CM if tooltip is not on...
Backport PR
#4183: ESC should be handled by CM if tooltip is not on
This PR fixes an issue on a key-press event with ESC in code cells, allowing the event to propagate to CM if tooltip is not on.
Currently, key-pressing ESC in a code cell simply removes tooltip, and the event is ignored by CM. I can not get out of insert mode when I am using Vim key binding.
