Fix crash when deleting last child in a tabbed or stacked container

There was no `current` child because the container was destroyed. This
makes it fall back to looking in the parent's current children list.

1 files changed, 12 insertions, 0 deletions

diff --git a/sway/input/seat.c b/sway/input/seat.c
index 1ea36466..436d18e2 100644
--- a/sway/input/seat.c
+++ b/sway/input/seat.c
@@ -829,6 +829,18 @@ struct sway_container *seat_get_active_child(struct sway_seat *seat,
         return NULL;
 }
 
+struct sway_container *seat_get_active_current_child(struct sway_seat *seat,
+                struct sway_container *container) {
+        struct sway_container *child = seat_get_active_child(seat, container);
+        if (child) {
+                return child;
+        }
+        if (container->current.children->length == 1) {
+                return container->current.children->items[0];
+        }
+        return NULL;
+}
+
 struct sway_container *seat_get_focus(struct sway_seat *seat) {
         if (!seat->has_focus) {
                 return NULL;