Make mouse drag in tiled mode swap containers if no edge is selected

Now the highlighted center area of containers triggers a swap action
instead of moving around the containers.

1 files changed, 15 insertions, 7 deletions

diff --git a/sway/input/seatop_move_tiling.c b/sway/input/seatop_move_tiling.c
index 7c31e695..e1506175 100644
--- a/sway/input/seatop_move_tiling.c
+++ b/sway/input/seatop_move_tiling.c
@@ -245,8 +245,12 @@ static void handle_button(struct sway_seat *seat, uint32_t time_msec,
                 target_node->sway_workspace : target_node->sway_container->workspace;
         enum wlr_edges edge = e->target_edge;
         int after = edge != WLR_EDGE_TOP && edge != WLR_EDGE_LEFT;
+        bool swap = edge == WLR_EDGE_NONE && target_node->type == N_CONTAINER;
+
+        if (!swap) {
+                container_detach(con);
+        }
 
-        container_detach(con);
 
         // Moving container into empty workspace
         if (target_node->type == N_WORKSPACE && edge == WLR_EDGE_NONE) {
@@ -254,13 +258,17 @@ static void handle_button(struct sway_seat *seat, uint32_t time_msec,
         } else if (target_node->type == N_CONTAINER) {
                 // Moving container before/after another
                 struct sway_container *target = target_node->sway_container;
-                enum sway_container_layout layout = container_parent_layout(target);
-                if (edge && !is_parallel(layout, edge)) {
-                        enum sway_container_layout new_layout = edge == WLR_EDGE_TOP ||
-                                edge == WLR_EDGE_BOTTOM ? L_VERT : L_HORIZ;
-                        container_split(target, new_layout);
+                if (swap) {
+                        container_swap(target_node->sway_container, con);
+                } else {
+                        enum sway_container_layout layout = container_parent_layout(target);
+                        if (edge && !is_parallel(layout, edge)) {
+                                enum sway_container_layout new_layout = edge == WLR_EDGE_TOP ||
+                                        edge == WLR_EDGE_BOTTOM ? L_VERT : L_HORIZ;
+                                container_split(target, new_layout);
+                        }
+                        container_add_sibling(target, con, after);
                 }
-                container_add_sibling(target, con, after);
         } else {
                 // Target is a workspace which requires splitting
                 enum sway_container_layout new_layout = edge == WLR_EDGE_TOP ||