Upstream fix: Can't focus component that was just mounted

[nakambo]

Environment

RNTester app. I am adding a test page to demonstrate the issue.

I have repro on 0.66 in my environment -- but I also repro on against main in the tester app.

Steps to reproduce the bug

1. Open RNTester app (macOS)
2. Click on "Focus on Mount"
3. Observe

Expected Behavior

Based on how the test page is written, the component should be focused.

Actual Behavior

It isn't focused.

Reproducible Demo

See repro instructions for demo in tester app. I will be adding a page to the tester app after creating this issue.

Additional context

• reactFocusIsNeeded is never called for a plain RCTView
• focus state is tracked on a per-view basis; should ideally be per-window, perhaps simply tracking it globally is sufficient as well. It should not be tracked per-view, because only one can ultimately win (the last one -- assuming it also didn't give up on focus while it was "winning").

[Saadnajmi]

Going to re-open this issue as a "potentially upstream able fix" kinda issue. Will revisit once we've let our fix make it's way downstream and has had time to be tested/verified more

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[github-actions]

This issue was closed because it has been stalled for 7 days with no activity.