which calls generic WillInsert, DidInsert to test for magic bogus
content and does the right thing.
You now can't delete magic content with user gestures, and when you
insert anything the magic kludgy is deleted first.
git-svn-id: svn://10.0.0.236/trunk@24055 18797224-902f-48f8-a5cc-f745e15eee43