### Inline widget

* You should be able to type after inline widget (if it is last child of parent <heading> or <paragraph>).
* 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
