tray: when a service is lost, remove all matching items

Before, only the first matching item would be removed, which could leave
stale items.

swaybar/tray/watcher.c

@@ -18,10 +18,6 @@ static int cmp_id(const void *item, const void *cmp_to) {
 	return strcmp(item, cmp_to);
 }
 
-static int cmp_service(const void *item, const void *cmp_to) {
-	return strncmp(item, cmp_to, strlen(cmp_to));
-}
-
 static int handle_lost_service(sd_bus_message *msg,
 		void *data, sd_bus_error *error) {
 	char *service, *old_owner, *new_owner;
@@ -33,18 +29,23 @@ static int handle_lost_service(sd_bus_message *msg,
 
 	if (!*new_owner) {
 		struct swaybar_watcher *watcher = data;
-		int idx = list_seq_find(watcher->items,
-				using_standard_protocol(watcher) ? cmp_id : cmp_service, service);
-		if (idx != -1) {
+		for (int idx = 0; idx < watcher->items->length; ++idx) {
 			char *id = watcher->items->items[idx];
+			int cmp_res = using_standard_protocol(watcher) ?
+				cmp_id(id, service) : strncmp(id, service, strlen(service));
+			if (cmp_res == 0) {
 				sway_log(SWAY_DEBUG, "Unregistering Status Notifier Item '%s'", id);
-			list_del(watcher->items, idx);
+				list_del(watcher->items, idx--);
 				sd_bus_emit_signal(watcher->bus, obj_path, watcher->interface,
 						"StatusNotifierItemUnregistered", "s", id);
 				free(id);
+				if (using_standard_protocol(watcher)) {
+					break;
+				}
+			}
 		}
 
-		idx = list_seq_find(watcher->hosts, cmp_id, service);
+		int idx = list_seq_find(watcher->hosts, cmp_id, service);
 		if (idx != -1) {
 			sway_log(SWAY_DEBUG, "Unregistering Status Notifier Host '%s'", service);
 			free(watcher->hosts->items[idx]);