fix(screen): hold and applylayout races #2251
Merged
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Fixes #2234 and similar situations when applying layout
This started happening because we separated the layout application and tab creation to two different steps (in preparation for applying layouts at runtime and to make swap layouts easier). This opened up some potential for races. This fix addresses the immediate concern, and we might want to add some UI indication to it in the future so that we won't be able to close tabs that are "pending".