Fix clicking on "+" button not working when a tab was underneath (#3755)

We were mistakenly pushing an opaque layer without intersecting it with
the content mask. Also, we were pushing two opaque layers for the same
div unnecessarily.

Release Notes:

- N/A
f83d156d7bAntonio Scandurra committed on 12/21/2023, 1:57:52 PM· committed by GitHubparents8dc691fb0ee7b2
1 file changedLine totals unavailable