wayland: Scale saved rect changing monitor scale

The saved rect is used to restore a saved window size. We need to
update this when the window is moved to a monitor with different scale,
so that if we unmaximize a window which was moved to a different
monitor while maximized (for example when unplugged) will restore to
the correct size.

https://bugzilla.gnome.org/show_bug.cgi?id=755097

src/wayland/meta-window-wayland.c

@@ -362,6 +362,7 @@ meta_window_wayland_main_monitor_changed (MetaWindow *window,
   /* Window size. */
   scale_rect_size (&window->rect, scale_factor);
   scale_rect_size (&window->unconstrained_rect, scale_factor);
+  scale_rect_size (&window->saved_rect, scale_factor);
 
   /* Window geometry offset (XXX: Need a better place, see
    * meta_window_wayland_move_resize). */