viewPadding property Null safety
The number of physical pixels on each side of the display rectangle into which the view can render, but which may be partially obscured by system UI (such as the system notification area), or or physical intrusions in the display (e.g. overscan regions on television screens or phone sensor housings).
When this property changes,
onMetricsChanged is called.
WindowPadding get viewPadding => viewConfiguration.viewPadding;