Fix crash when adding output

2 files changed, 5 insertions, 4 deletions

diff --git a/sway/tree/container.c b/sway/tree/container.c
index b932925d..6ea0cc94 100644
--- a/sway/tree/container.c
+++ b/sway/tree/container.c
@@ -764,8 +764,7 @@ void container_damage_whole(struct sway_container *container) {
  * Return the output which will be used for scale purposes.
  * This is the most recently entered output.
  */
-static struct sway_output *container_get_effective_output(
-                struct sway_container *con) {
+struct sway_output *container_get_effective_output(struct sway_container *con) {
         if (con->outputs->length == 0) {
                 return NULL;
         }
diff --git a/sway/tree/view.c b/sway/tree/view.c
index 4abf1abb..2c0c1aa9 100644
--- a/sway/tree/view.c
+++ b/sway/tree/view.c
@@ -889,8 +889,10 @@ void view_add_mark(struct sway_view *view, char *mark) {
 
 static void update_marks_texture(struct sway_view *view,
                 struct wlr_texture **texture, struct border_colors *class) {
-        struct sway_output *output =
-                view->swayc->outputs->items[view->swayc->outputs->length - 1];
+        struct sway_output *output = container_get_effective_output(view->swayc);
+        if (!output) {
+                return;
+        }
         if (*texture) {
                 wlr_texture_destroy(*texture);
                 *texture = NULL;