Summary:
Fix a issue that RCTModalHostView can't be dismissed while being presented
Steps To Reproduce
A native modal presented view controller is being dismissed before the first screen shows.
A RCTModalHostView is presented when the first screen shows.
The RCTModalHostView will be dismissed after an asynchronous callback.
If the callback was called before the completion of the presenting animation, the RCTModalHostView will not be dismissed.
## Changelog
[iOS] [Fixed] - Fix that RCTModalHostView can't be dismissed while being presented
Pull Request resolved: https://github.com/facebook/react-native/pull/29745
Reviewed By: shergin
Differential Revision: D23566487
Pulled By: sammy-SC
fbshipit-source-id: bd95f200b79fa75e2387e402091d58c0f538759c
Mi-ZAZandFacebook GitHub Bot
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