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 I added a spreadUp attribute to customFleatherThemeData. Then modified the _selectHeading() method of the editor_toolbar.dart file `Positioned( bottom:...
I found fix/toolbar_selector_positioning is deleted, it seems you merged to the mastr? So I verified in the master branch, it still have problem.  My test code:
I'm coming. It test great!🎉 But maybe the Y minus the height of the toolbar will be more better. @Amir-P  