Use editable#attachListener to add listener to document element.
Merge branch 't/10219'
Do not use outdated document instance.
Merge branch 't/10212'
Fixed horrible code-style of autogrow resizeEditor().
Do not resize editor when height hasn't been changed.
Merge branch 't/10196b'
Updated 4.0.3 changelog entries.
4.0.3 changelog corrected.