simplify hit testing in SKTextWithIconCell, use super and return None when outside text or icon.
simplify hit testing in SKTextWithIconCell, use super and return None when outside text or icon.

git-svn-id: 765db44a9620ed55f4f8addfd3c14fe8cd57f6bb@5317 0fceea05-a30d-0410-8a8b-80ef821fb0a1

nanoant/Skim,nanoant/Skim,nanoant/Skim,nanoant/Skim,nanoant/Skim