ROOT's transient window has "maximize" button disabled and window of fixed...

ROOT's transient window has "maximize" button disabled and window of fixed size. I do not see anything
in GUI, that makes window to have these properties. When window is done transient, disable maximize button
and remove resizeable bit from window's style mask.


git-svn-id: http://root.cern.ch/svn/root/trunk@43920 27541ba8-7e3a-0410-8455-c3a389f83636