You should be able to type after inline widget (if it is last child of parent or ).
Select text before/after widget and expand selection beyond widget. The widget should be selected and selection expanded beyond it on further expanding.
The inline-widget should work in nested editable widget (table).
Use "insert placeholder" toolbar button to insert inline widget.
Selected inline widget should have
widget border (blue)
activate fake selection - the "fake selection" element will be shown above the editor