mouseCursor property Null safety
The cursor for a mouse pointer when it enters or is hovering over the items.
If mouseCursor is a MaterialStateProperty<MouseCursor>, MaterialStateProperty.resolve is used for the following MaterialStates:
If null, then the value of BottomNavigationBarThemeData.mouseCursor is used. If that is also null, then MaterialStateMouseCursor.clickable is used.
- MaterialStateMouseCursor, which can be used to create a MouseCursor that is also a MaterialStateProperty<MouseCursor>.
final MouseCursor? mouseCursor;