wayland: refactor window destruction and focus

The previous code was leaving focus fields dirty in MetaWaylandPointer
and MetaWaylandKeyboard at time (which could crash the X server
because of invalid object IDs)
The new code is more tighly integrated in the normal X11 code
for handling keyboard focus (meaning that the core idea of input
focus is also correct now), so that meta_window_unmanage() can
do the right thing. As a side benefit, clicking on wayland clients
now unfocus X11 clients.
For the mouse focus, we need to clear the surface pointer when
the metawindowactor is destroyed (even if the actual actor is
kept alive for effects), so that a repick finds a different pointer
focus.

https://bugzilla.gnome.org/show_bug.cgi?id=705859

src/core/window.c

@@ -62,6 +62,10 @@
 
 #include <X11/extensions/Xcomposite.h>
 
+#ifdef HAVE_WAYLAND
+#include "meta-wayland-private.h"
+#endif
+
 /* Windows that unmaximize to a size bigger than that fraction of the workarea
  * will be scaled down to that size (while maintaining aspect ratio).
  * Windows that cover an area greater then this size are automaximized on map.
@@ -2103,6 +2107,11 @@ meta_window_unmanage (MetaWindow  *window,
       meta_error_trap_pop (window->display);
     }
 
+#ifdef HAVE_WAYLAND
+  if (window->surface)
+    meta_wayland_surface_free (window->surface);
+#endif
+
   meta_prefs_remove_listener (prefs_changed_callback, window);
 
   meta_screen_queue_check_fullscreen (window->screen);