window: Fix resizing issues
window: Fix resizing issues

Fix widgets inside the window jumping to 0,0 during resizes.

clutter-project/mx,pwithnall/mx,pwithnall/mx,jonnylamb/mx,pwithnall/mx,clutter-project/mx,pwithnall/mx,jonnylamb/mx,jonnylamb/mx,clutter-project/mx,clutter-project/mx,jonnylamb/mx