container: Store app_id attribute for views.

include/container.h

@@ -78,6 +78,7 @@ struct sway_container {
 	// Attributes that mostly views have.
 	char *name;
 	char *class;
+	char *app_id;
 
 	int gaps;
 

sway/container.c

@@ -53,6 +53,9 @@ static void free_swayc(swayc_t *cont) {
 	if (cont->class) {
 		free(cont->class);
 	}
+	if (cont->app_id) {
+		free(cont->app_id);
+	}
 	free(cont);
 }
 
@@ -219,6 +222,8 @@ swayc_t *new_view(swayc_t *sibling, wlc_handle handle) {
 	view->name = title ? strdup(title) : NULL;
 	const char *class = wlc_view_get_class(handle);
 	view->class = class ? strdup(class) : NULL;
+	const char *app_id = wlc_view_get_app_id(handle);
+	view->app_id = app_id ? strdup(app_id) : NULL;
 	view->visible = true;
 	view->is_focused = true;
 	// Setup geometry
@@ -253,6 +258,8 @@ swayc_t *new_floating_view(wlc_handle handle) {
 	view->name = title ? strdup(title) : NULL;
 	const char *class = wlc_view_get_class(handle);
 	view->class = class ? strdup(class) : NULL;
+	const char *app_id = wlc_view_get_app_id(handle);
+	view->app_id = app_id ? strdup(app_id) : NULL;
 	view->visible = true;
 
 	// Set the geometry of the floating view