Fix blinking in `editor2` (#3272)

This also introduces new APIs in `ViewContext` for observing window
focus changes.

Release Notes:

- N/A
c81440424bMax Brunsfeld committed on 11/8/2023, 9:53:43 PM· committed by GitHubparents23a97f5b6b0fea
4 files changedLine totals unavailable