Fix invalid pointers when using resize grow width on first/last siblings

1 files changed, 11 insertions, 2 deletions

diff --git a/sway/commands/resize.c b/sway/commands/resize.c
index f6141afc..6cdeb90c 100644
--- a/sway/commands/resize.c
+++ b/sway/commands/resize.c
@@ -173,8 +173,17 @@ void container_resize_tiled(struct sway_container *con,
         int index = container_sibling_index(con);
 
         if (axis == AXIS_HORIZONTAL || axis == AXIS_VERTICAL) {
-                prev = siblings->items[index - 1];
-                next = siblings->items[index + 1];
+                if (index == 0) {
+                        next = siblings->items[1];
+                } else if (index == siblings->length - 1) {
+                        // Convert edge to top/left
+                        next = con;
+                        con = siblings->items[index - 1];
+                        amount = -amount;
+                } else {
+                        prev = siblings->items[index - 1];
+                        next = siblings->items[index + 1];
+                }
         } else if (axis == WLR_EDGE_TOP || axis == WLR_EDGE_LEFT) {
                 if (!sway_assert(index > 0, "Didn't expect first child")) {
                         return;