X11 window managers are very buggy when it comes to having a window start

X11 window managers are very buggy when it comes to having a window start
in full screen mode. So we'll resort to creating a normal window, and then
switching to full screen once it is mapped. Unfortunately it means we need
to handle delaying some resize handling.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4958 3789f03b-4d11-0410-bbf8-ca57d06f2519