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	surface: add WLR_SURFACE_STATE_SUBSURFACES
This allows to figure out when the subsurface list has changed: subsurface added, removed, or re-ordered. In the case where the subsurface list hasn't changed, some book-keeping operations can be skipped.
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					 2 changed files with 5 additions and 0 deletions
				
			
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					@ -27,6 +27,7 @@ enum wlr_surface_state_field {
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	WLR_SURFACE_STATE_SCALE = 1 << 6,
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						WLR_SURFACE_STATE_SCALE = 1 << 6,
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	WLR_SURFACE_STATE_FRAME_CALLBACK_LIST = 1 << 7,
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						WLR_SURFACE_STATE_FRAME_CALLBACK_LIST = 1 << 7,
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	WLR_SURFACE_STATE_VIEWPORT = 1 << 8,
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						WLR_SURFACE_STATE_VIEWPORT = 1 << 8,
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						WLR_SURFACE_STATE_SUBSURFACES = 1 << 9,
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};
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					};
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struct wlr_surface_state {
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					struct wlr_surface_state {
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					@ -698,6 +698,7 @@ static void subsurface_destroy(struct wlr_subsurface *subsurface) {
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	wl_list_remove(&subsurface->surface_destroy.link);
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						wl_list_remove(&subsurface->surface_destroy.link);
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	if (subsurface->parent) {
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						if (subsurface->parent) {
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							subsurface->parent->pending.committed |= WLR_SURFACE_STATE_SUBSURFACES;
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		wl_list_remove(&subsurface->current.link);
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							wl_list_remove(&subsurface->current.link);
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		wl_list_remove(&subsurface->pending.link);
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							wl_list_remove(&subsurface->pending.link);
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		wl_list_remove(&subsurface->parent_destroy.link);
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							wl_list_remove(&subsurface->parent_destroy.link);
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					@ -947,6 +948,7 @@ static void subsurface_handle_place_above(struct wl_client *client,
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		node = &sibling->pending.link;
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							node = &sibling->pending.link;
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	}
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						}
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						subsurface->parent->pending.committed |= WLR_SURFACE_STATE_SUBSURFACES;
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	wl_list_remove(&subsurface->pending.link);
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						wl_list_remove(&subsurface->pending.link);
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	wl_list_insert(node, &subsurface->pending.link);
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						wl_list_insert(node, &subsurface->pending.link);
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					@ -979,6 +981,7 @@ static void subsurface_handle_place_below(struct wl_client *client,
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		node = &sibling->pending.link;
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							node = &sibling->pending.link;
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	}
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						}
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						subsurface->parent->pending.committed |= WLR_SURFACE_STATE_SUBSURFACES;
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	wl_list_remove(&subsurface->pending.link);
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						wl_list_remove(&subsurface->pending.link);
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	wl_list_insert(node->prev, &subsurface->pending.link);
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						wl_list_insert(node->prev, &subsurface->pending.link);
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					@ -1190,6 +1193,7 @@ struct wlr_subsurface *subsurface_create(struct wlr_surface *surface,
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	// link parent
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						// link parent
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	subsurface->parent = parent;
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						subsurface->parent = parent;
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						subsurface->parent->pending.committed |= WLR_SURFACE_STATE_SUBSURFACES;
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	wl_signal_add(&parent->events.destroy, &subsurface->parent_destroy);
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						wl_signal_add(&parent->events.destroy, &subsurface->parent_destroy);
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	subsurface->parent_destroy.notify = subsurface_handle_parent_destroy;
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						subsurface->parent_destroy.notify = subsurface_handle_parent_destroy;
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	wl_list_insert(parent->current.subsurfaces_above.prev, &subsurface->current.link);
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						wl_list_insert(parent->current.subsurfaces_above.prev, &subsurface->current.link);
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