[Mobile] Hide Cursor at readonly mode

[MeguRobert]

My issue is about [Mobile]

There is no option to hide the Editor's cursor. At least at the readonly mode I think it would be useful.

[agil3st]

This one works for me. #139 by @WingCH
Just change focusNode: FocusNode() if you need.

[NeroSong]

Maybe you can try to wrap it with an AbsorbPointer, it works for me.