seatop_move_tiling: do not move to descendant

In seatop_move_tiling, it is possible to cause a stack overflow by
dragging a container into one of its descendants. This disables the
ability to move into a descendant.

1 files changed, 2 insertions, 1 deletions

diff --git a/sway/input/seatop_move_tiling.c b/sway/input/seatop_move_tiling.c
index 422a4aa2..1e548f5a 100644
--- a/sway/input/seatop_move_tiling.c
+++ b/sway/input/seatop_move_tiling.c
@@ -164,7 +164,8 @@ static void handle_motion_postthreshold(struct sway_seat *seat) {
 
         // Use the hovered view - but we must be over the actual surface
         con = node->sway_container;
-        if (!con->view->surface || node == &e->con->node) {
+        if (!con->view->surface || node == &e->con->node
+                        || node_has_ancestor(node, &e->con->node)) {
                 e->target_node = NULL;
                 e->target_edge = WLR_EDGE_NONE;
                 return;