project wide: clean up event listeners on shutdown

This ensures all event listeners are removed before the emitting
wlroots object is being destroyed. This will be enforced with asserts
in wlroots 0.19 but there is no reason to not do it right now either.

This change in wlroots 0.19 is implemented via commit
8f56f7ca43257cc05c7c4eb57a0f541e05cf9a79
"Assert (almost all) signals have no attached listeners on destroy"

include/decorations.h

@@ -12,4 +12,7 @@ void xdg_server_decoration_init(struct server *server);
 void kde_server_decoration_update_default(void);
 void kde_server_decoration_set_view(struct view *view, struct wlr_surface *surface);
 
+void kde_server_decoration_finish(struct server *server);
+void xdg_server_decoration_finish(struct server *server);
+
 #endif /* LABWC_DECORATIONS_H */

include/labwc.h

@@ -435,6 +435,7 @@ struct constraint {
 
 void xdg_popup_create(struct view *view, struct wlr_xdg_popup *wlr_popup);
 void xdg_shell_init(struct server *server);
+void xdg_shell_finish(struct server *server);
 
 /*
  * desktop.c routines deal with a collection of views
@@ -539,6 +540,7 @@ void interactive_cancel(struct view *view);
 enum view_edge edge_from_cursor(struct seat *seat, struct output **dest_output);
 
 void output_init(struct server *server);
+void output_finish(struct server *server);
 void output_manager_init(struct server *server);
 struct output *output_from_wlr_output(struct server *server,
 	struct wlr_output *wlr_output);

include/layers.h

@@ -37,6 +37,7 @@ struct lab_layer_popup {
 };
 
 void layers_init(struct server *server);
+void layers_finish(struct server *server);
 
 void layers_arrange(struct output *output);
 void layer_try_set_focus(struct seat *seat,

src/decorations/kde-deco.c

@@ -133,3 +133,8 @@ kde_server_decoration_init(struct server *server)
 	server->kde_server_decoration.notify = handle_new_server_decoration;
 }
 
+void
+kde_server_decoration_finish(struct server *server)
+{
+	wl_list_remove(&server->kde_server_decoration.link);
+}

src/decorations/xdg-deco.c

@@ -127,3 +127,9 @@ xdg_server_decoration_init(struct server *server)
 		&server->xdg_toplevel_decoration);
 	server->xdg_toplevel_decoration.notify = xdg_toplevel_decoration;
 }
+
+void
+xdg_server_decoration_finish(struct server *server)
+{
+	wl_list_remove(&server->xdg_toplevel_decoration.link);
+}

src/idle.c

@@ -17,9 +17,9 @@ struct lab_idle_manager {
 	struct {
 		struct wlr_idle_inhibit_manager_v1 *manager;
 		struct wl_listener on_new_inhibitor;
+		struct wl_listener on_destroy;
 	} inhibitor;
 	struct wlr_seat *wlr_seat;
-	struct wl_listener on_display_destroy;
 };
 
 static struct lab_idle_manager *manager;
@@ -59,13 +59,10 @@ handle_idle_inhibitor_new(struct wl_listener *listener, void *data)
 }
 
 static void
-handle_display_destroy(struct wl_listener *listener, void *data)
+handle_inhibitor_manager_destroy(struct wl_listener *listener, void *data)
 {
-	/*
-	 * All the managers will react to the display
-	 * destroy signal as well and thus clean up.
-	 */
-	wl_list_remove(&manager->on_display_destroy.link);
+	wl_list_remove(&manager->inhibitor.on_new_inhibitor.link);
+	wl_list_remove(&manager->inhibitor.on_destroy.link);
 	zfree(manager);
 }
 
@@ -83,8 +80,9 @@ idle_manager_create(struct wl_display *display, struct wlr_seat *wlr_seat)
 	wl_signal_add(&manager->inhibitor.manager->events.new_inhibitor,
 		&manager->inhibitor.on_new_inhibitor);
 
-	manager->on_display_destroy.notify = handle_display_destroy;
-	wl_display_add_destroy_listener(display, &manager->on_display_destroy);
+	manager->inhibitor.on_destroy.notify = handle_inhibitor_manager_destroy;
+	wl_signal_add(&manager->inhibitor.manager->events.destroy,
+		&manager->inhibitor.on_destroy);
 }
 
 void

src/input/cursor.c

@@ -1520,6 +1520,7 @@ void cursor_finish(struct seat *seat)
 	wl_list_remove(&seat->request_cursor.link);
 	wl_list_remove(&seat->request_set_shape.link);
 	wl_list_remove(&seat->request_set_selection.link);
+	wl_list_remove(&seat->request_set_primary_selection.link);
 
 	wlr_xcursor_manager_destroy(seat->xcursor_manager);
 	wlr_cursor_destroy(seat->cursor);

src/layers.c

@@ -600,3 +600,9 @@ layers_init(struct server *server)
 	wl_signal_add(&server->layer_shell->events.new_surface,
 		&server->new_layer_surface);
 }
+
+void
+layers_finish(struct server *server)
+{
+	wl_list_remove(&server->new_layer_surface.link);
+}

src/output.c

@@ -572,6 +572,15 @@ output_init(struct server *server)
 	output_manager_init(server);
 }
 
+static void output_manager_finish(struct server *server);
+
+void
+output_finish(struct server *server)
+{
+	wl_list_remove(&server->new_output.link);
+	output_manager_finish(server);
+}
+
 static void
 output_update_for_layout_change(struct server *server)
 {
@@ -890,6 +899,15 @@ output_manager_init(struct server *server)
 		&server->gamma_control_set_gamma);
 }
 
+static void
+output_manager_finish(struct server *server)
+{
+	wl_list_remove(&server->output_layout_change.link);
+	wl_list_remove(&server->output_manager_apply.link);
+	wl_list_remove(&server->output_manager_test.link);
+	wl_list_remove(&server->gamma_control_set_gamma.link);
+}
+
 struct output *
 output_from_wlr_output(struct server *server, struct wlr_output *wlr_output)
 {

src/seat.c

@@ -588,6 +588,8 @@ seat_finish(struct server *server)
 	struct seat *seat = &server->seat;
 	wl_list_remove(&seat->new_input.link);
 	wl_list_remove(&seat->focus_change.link);
+	wl_list_remove(&seat->virtual_pointer_new.link);
+	wl_list_remove(&seat->virtual_keyboard_new.link);
 
 	struct input *input, *next;
 	wl_list_for_each_safe(input, next, &seat->inputs, link) {

src/server.c

@@ -752,12 +752,26 @@ server_finish(struct server *server)
 		wl_event_source_remove(sighup_source);
 	}
 	wl_display_destroy_clients(server->wl_display);
+
+	seat_finish(server);
+	output_finish(server);
+	xdg_shell_finish(server);
+	layers_finish(server);
+	kde_server_decoration_finish(server);
+	xdg_server_decoration_finish(server);
+	wl_list_remove(&server->new_constraint.link);
+	wl_list_remove(&server->output_power_manager_set_mode.link);
+	wl_list_remove(&server->tearing_new_object.link);
+
 	wlr_backend_destroy(server->backend);
 	wlr_allocator_destroy(server->allocator);
+
+	wl_list_remove(&server->renderer_lost.link);
 	wlr_renderer_destroy(server->renderer);
-	seat_finish(server);
+
 	workspaces_destroy(server);
 	wlr_scene_node_destroy(&server->scene->tree.node);
+
 	wl_display_destroy(server->wl_display);
 	free(server->ssd_hover_state);
 }

src/xdg.c

@@ -1012,3 +1012,10 @@ xdg_shell_init(struct server *server)
 		&server->xdg_activation_new_token);
 }
 
+void
+xdg_shell_finish(struct server *server)
+{
+	wl_list_remove(&server->new_xdg_toplevel.link);
+	wl_list_remove(&server->xdg_activation_request.link);
+	wl_list_remove(&server->xdg_activation_new_token.link);
+}

src/xwayland.c

@@ -1237,6 +1237,10 @@ void
 xwayland_server_finish(struct server *server)
 {
 	struct wlr_xwayland *xwayland = server->xwayland;
+	wl_list_remove(&server->xwayland_new_surface.link);
+	wl_list_remove(&server->xwayland_server_ready.link);
+	wl_list_remove(&server->xwayland_xwm_ready.link);
+
 	/*
 	 * Reset server->xwayland to NULL first to prevent callbacks (like
 	 * server_global_filter) from accessing it as it is destroyed