mouseCursor property Null safety
The cursor for a mouse pointer when it enters or is hovering over the widget.
If this property is null, SystemMouseCursors.text will be used.
The mouseCursor is the only property of EditableText that controls the appearance of the mouse pointer. All other properties related to "cursor" stands for the text cursor, which is usually a blinking vertical line at the editing position.
final MouseCursor? mouseCursor;