window: Notify about size-change when changing monitor
When moving to another monitor the window size may change in some cases. While unconditionally notifying a size change is not always correct, it animates the window when moved to another monitor in GNOME Shell.
Keep in mind that we already emit this signal even when the size doesn't actually change: when a window goes from a tiling-left to a tiling-right state and vice versa.
The MetaSizeChange
value is not used at all in GNOME Shell.
Edited by Alessandro Bono