sway/commands/layout: flatten parent once

Applying layout changes to the parent of the parent, in case the parent only has a single child, stops the creation of a chain of single child containers.

Closes: https://github.com/swaywm/sway/issues/7945

sway/commands/layout.c

@@ -134,6 +134,15 @@ struct cmd_results *cmd_layout(int argc, char **argv) {
 	// Operate on parent container, like i3.
 	if (container) {
 		container = container->pending.parent;
+		// If parent has only a singe child operate on its parent and
+		// flatten once, like i3
+		if (container && container->pending.children->length == 1) {
+			struct sway_container *child = container->pending.children->items[0];
+			struct sway_container *parent = container->pending.parent;
+			container_replace(container, child);
+			container_begin_destroy(container);
+			container = parent;
+		}
 	}
 
 	// We could be working with a container OR a workspace. These are different

sway/input/seatop_default.c

@@ -1111,7 +1111,7 @@ static void handle_rebase(struct sway_seat *seat, uint32_t time_msec) {
 			cursor->cursor->x, cursor->cursor->y, &surface, &sx, &sy);
 
 	if (surface) {
-		if (seat_is_input_allowed(seat, surface)) {
+		if (seat_is_input_allowed(seat, surface) && !cursor->hidden) {
 			wlr_seat_pointer_notify_enter(seat->wlr_seat, surface, sx, sy);
 			wlr_seat_pointer_notify_motion(seat->wlr_seat, time_msec, sx, sy);
 		}