waitUntilFirstFrameRasterized property Null safety
A future that completes when the Flutter engine has rasterized the first frame.
Usually, the time that a frame is rasterized is very close to the time that it gets presented on the display. Specifically, rasterization is the last expensive phase of a frame that's still in Flutter's control.
- firstFrameRasterized, whether this future has completed or not.
Future<void> get waitUntilFirstFrameRasterized => _firstFrameCompleter.future;