TextArea, TextInput: can't receive focus when isEditable is false (closes #564)
Scroll bars: disable focus on children.
FeathersControl: hides focus on focus out
List, GroupedList: focus disabled when selection is disabled
Item renderers: switched to owner.stopScrolling() instead of event.stopPropagation() so that mouse focus is possible on accessories
Merge branch 'v1.1.x'