luckysmg 4248f33948 [iOS][Keyboard] Reland wait vsync on UI thread and update viewport inset to avoid jitter (flutter/engine#43463) ...

*List which issues are fixed by this PR. You must list at least one issue.*
- https://github.com/flutter/flutter/issues/120555
- https://github.com/flutter/flutter/issues/130028

### New test for crash case: 
`testKeyboardAnimationWillNotCrashWhenEngineDestroyed`

### The diff with original PR:

Use `dispatch_async(dispatch_get_main_queue()` to switch to platform thread.

2023-07-10 16:25:05 +00:00

..

src/flutter

[iOS][Keyboard] Reland wait vsync on UI thread and update viewport inset to avoid jitter (flutter/engine#43463)

2023-07-10 16:25:05 +00:00