[CRASH] : with the new scrolled window containing the headers in the compose window

[Emmanuel <e allaud wanadoo fr>]

	Hi all,
to reproduce it : just use the grip under the headers in the compose 
window to reduce the size of them and try to reduce to even hide the 
"To:" field -> crash. Problem is : even with gdb it locks hard X, and I 
was not able to recover a stack trace...
Bye
Manu