(desktop|tree)/output: Do not use layout listener to arrange

Output layout changes originate from the centralized modeset
infrastructure and request_state which already takes care of arranging
and updating outputs as needed.

include/sway/output.h

@@ -134,8 +134,6 @@ enum sway_container_layout output_get_default_layout(
 
 enum wlr_direction opposite_direction(enum wlr_direction d);
 
-void handle_output_layout_change(struct wl_listener *listener, void *data);
-
 void handle_output_manager_apply(struct wl_listener *listener, void *data);
 
 void handle_output_manager_test(struct wl_listener *listener, void *data);

include/sway/server.h

@@ -45,7 +45,6 @@ struct sway_server {
 	struct sway_input_manager *input;
 
 	struct wl_listener new_output;
-	struct wl_listener output_layout_change;
 	struct wl_listener renderer_lost;
 
 	struct wlr_idle_notifier_v1 *idle_notifier_v1;

include/sway/tree/root.h

@@ -16,8 +16,6 @@ struct sway_root {
 	struct sway_node node;
 	struct wlr_output_layout *output_layout;
 
-	struct wl_listener output_layout_change;
-
 	// scene node layout:
 	// - root
 	// 	- staging

sway/desktop/output.c

@@ -543,13 +543,6 @@ void handle_new_output(struct wl_listener *listener, void *data) {
 	request_modeset(server);
 }
 
-void handle_output_layout_change(struct wl_listener *listener,
-		void *data) {
-	struct sway_server *server =
-		wl_container_of(listener, server, output_layout_change);
-	update_output_manager_config(server);
-}
-
 static struct output_config *output_config_for_config_head(
 		struct wlr_output_configuration_head_v1 *config_head,
 		struct sway_output *output) {

sway/server.c

@@ -277,9 +277,6 @@ bool server_init(struct sway_server *server) {
 
 	server->new_output.notify = handle_new_output;
 	wl_signal_add(&server->backend->events.new_output, &server->new_output);
-	server->output_layout_change.notify = handle_output_layout_change;
-	wl_signal_add(&root->output_layout->events.change,
-		&server->output_layout_change);
 
 	server->xdg_output_manager_v1 =
 		wlr_xdg_output_manager_v1_create(server->wl_display, root->output_layout);

sway/tree/root.c

@@ -19,12 +19,6 @@
 
 struct sway_root *root;
 
-static void output_layout_handle_change(struct wl_listener *listener,
-		void *data) {
-	arrange_root();
-	transaction_commit_dirty();
-}
-
 struct sway_root *root_create(struct wl_display *wl_display) {
 	struct sway_root *root = calloc(1, sizeof(struct sway_root));
 	if (!root) {
@@ -81,14 +75,10 @@ struct sway_root *root_create(struct wl_display *wl_display) {
 	root->non_desktop_outputs = create_list();
 	root->scratchpad = create_list();
 
-	root->output_layout_change.notify = output_layout_handle_change;
-	wl_signal_add(&root->output_layout->events.change,
-		&root->output_layout_change);
 	return root;
 }
 
 void root_destroy(struct sway_root *root) {
-	wl_list_remove(&root->output_layout_change.link);
 	list_free(root->scratchpad);
 	list_free(root->non_desktop_outputs);
 	list_free(root->outputs);