Convince OS X to fully fullscreen windows

We typically want to have the full screen given to
the content, not the aspect-ratio preserving behavior
that newer OS X has.

https://bugzilla.gnome.org/show_bug.cgi?id=779383

gdk/quartz/GdkQuartzNSWindow.c

@@ -840,4 +840,19 @@ update_context_from_dragging_info (id <NSDraggingInfo> sender)
   inMaximizeTransition = NO;
 }
 
+-(NSSize)window:(NSWindow *)window willUseFullScreenContentSize:(NSSize)proposedSize
+{
+  return [[window screen] frame].size;
+}
+
+-(void)windowWillEnterFullScreen:(NSNotification *)aNotification
+{
+  lastUnfullscreenFrame = [self frame];
+}
+
+-(void)windowWillExitFullScreen:(NSNotification *)aNotification
+{
+  [self setFrame:lastUnfullscreenFrame display:YES]
+}
+
 @end

gdk/quartz/GdkQuartzNSWindow.h

@@ -37,6 +37,7 @@
 
   NSRect  lastUnmaximizedFrame;
   NSRect  lastMaximizedFrame;
+  NSRect  lastUnfullscreenFrame;
   BOOL    inMaximizeTransition;
 }