Typing into a text area wasn't working properly. Problem was that when the text
changed we were reflowing the text frames with a resize reflow command and
we thought we could optimize the reflow. So I changed ContentChanged() to
mark each text frame dirty so we would know not to do the optimization
git-svn-id: svn://10.0.0.236/trunk@50261 18797224-902f-48f8-a5cc-f745e15eee43
69fbd973a0