Smart Select warning UI when hitting shift + enter multiple times

[justschen]

Testing #22536

on linux, ubuntu 22

1. shift + enter when notification is already up
2. Pops up again.

When the warning is available, maybe it's better to just make it disappear?

[anthonykim1]

This is expected behavior since if they are looking at this message, they are not able to shift+enter and execute their code. We want to let them know so they don't get confused of why shift+enter doesn't work all the sudden in case they come back after not reading and closing the warning message.