[1.20] Backport session persistence improvements #17049
Merged
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This contains all the changes of 5dda507, c4c5206, 9f08ee7, and
5f10159 (#16598 and all related PRs), but without the buffer restore
feature. The hope is that these changes fix some rarer issues
we've been hearing about, where persistence doesn't work correctly.
Validation Steps Performed
This changeset was tested on Windows 11 with 2 windows and 4 tabs
where 1 tab had 2 mixed split panes. All windows and tabs got
restored properly. It didn't crash on Windows 10.