Implement 'fullscreen global'

src/handlers.c

@@ -648,7 +648,7 @@ static int handle_client_message(xcb_client_message_event_t *event) {
              (event->data.data32[0] == _NET_WM_STATE_ADD ||
               event->data.data32[0] == _NET_WM_STATE_TOGGLE))) {
             DLOG("toggling fullscreen\n");
-            con_toggle_fullscreen(con);
+            con_toggle_fullscreen(con, CF_OUTPUT);
         }
 
         tree_render();