[android] Animation when opening keyboard is unsynchronized #116836
Description
This issue is the android version of #105687 (which is fixed by flutter/engine@a5ff362).
VID_20231024_082550.mp4
The keyboard animation is jittery most of time.
Notice that the issue is much evident and occurs often on real device running in release mode.
As pointed out in the iOS fix, issue is:
"if setViewportMetrics called before framework's vsync process callback (rebuild & layout & paint), will cause jitter keyboard animation.So this PR is to keep the time when updateViewportMetrics call to framework side legal".
Demo code here:
https://github.com/delfme/flutter-native-text-input-repo
With this fix, flutter would finally provide a native-like keyboard animation on both ios and android 🚀