Text nodes deep rendering (#1125)

Deep space rerender (#1093)

1. Put caret after each Foo text (Foo^).
2. Press space.

Expected: Inserted space is visible. Space on the beginning of the next text node is replaced with  .

Link ending with styles (ckeditor5-typing#120)

1. Put caret on the end of the link (Link Bold^).
2. Insert some text.

Expected: Bold text is inserted as a part of the link. No errors thrown in the browser dev console.