ivi-shell: avoid inserting a ivi_layer to multiple screens.

In just previous wl_list_for_each_safe, list of layer in a screen is
cleaned up. And then, the list is re-constructed from
pending.layer_list.

In this re-construction, if order.link of a layer were inserted into a
screen whose number is later one of current screen, the order.link will
inserted into layer_list of two screens. This shall be avoided.

However, if we want to implement a feature to allow a layer to be added
to multiple screens. A layer shall have several order.link per screens.
So, I marked here as TODO.

Signed-off-by: Nobuhiko Tanibata <NOBUHIKO_TANIBATA@xddp.denso.co.jp>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

ivi-shell/ivi-layout.c

@@ -819,6 +819,9 @@ commit_screen_list(struct ivi_layout *layout)
 
 			wl_list_for_each(ivilayer, &iviscrn->pending.layer_list,
 					 pending.link) {
+				/* FIXME: avoid to insert order.link to multiple screens */
+				wl_list_remove(&ivilayer->order.link);
+
 				wl_list_insert(&iviscrn->order.layer_list,
 					       &ivilayer->order.link);
 				ivilayer->on_screen = iviscrn;