Created attachment 207260 [details]
fix for fullscreen on pre-10.7 quartz

gdk_window_set_decorations() : the pre-10.7 version of this code works by creating a new top level window with or without a title bar, and then stuffing the existing contentView into it (the old top level window is released).

while this code works, its not enough: the window is not visible, and has not had all the properties of the old top level window carried over (e.g. title). so there are two parts to this patch: 

(1) in gdk_window_set_decorations(), we make sure that we map all the old window's properties (at least, all those that GDK/GTK touches) onto the new window.

(2a) in gdk_window_(un)fullscreen() make sure to call makeKeyAndOrderFront so that the new window created by gdk_window_set_decorations is visible. this has no adverse effects on 10.7, even though it didn't create a new window (just called setStyleMask on the existing window).

(2b) in gdk_window_fullscreen() explicitly resize the contentView to fill the new larger window, which otherwise doesn't appear to happen. 

the old code would have worked for code that made a window fullscreen before displaying it. it doesn't work for an app that can go in and out of fullscreen mode.

confirmation that this doesn't adversely affect the 10.7 functionality would be a good idea.