view: add new container as a sibling of tiled view

If the focused container is floating by itself, create a new container
in tiling mode as a sibling of the inactive focused container instead of
creating it as a sibling of everything that is in tiling mode in that
workspace. This is the i3 behavior.

sway/tree/view.c

@@ -729,10 +729,29 @@ void view_map(struct sway_view *view, struct wlr_surface *wlr_surface,
 	}
 
 	struct sway_seat *seat = input_manager_current_seat();
-	struct sway_node *node = ws ? seat_get_focus_inactive(seat, &ws->node)
-		: seat_get_focus_inactive(seat, &root->node);
-	struct sway_container *target_sibling = node->type == N_CONTAINER ?
-		node->sway_container : NULL;
+	struct sway_node *node =
+		seat_get_focus_inactive(seat, ws ? &ws->node : &root->node);
+	struct sway_container *target_sibling = NULL;
+	if (node && node->type == N_CONTAINER) {
+		if (container_is_floating(node->sway_container)) {
+			// If we're about to launch the view into the floating container, then
+			// launch it as a tiled view instead.
+			if (ws) {
+				target_sibling = seat_get_focus_inactive_tiling(seat, ws);
+				if (target_sibling) {
+					struct sway_container *con =
+						seat_get_focus_inactive_view(seat, &target_sibling->node);
+					if (con)  {
+						target_sibling = con;
+					}
+				}
+			} else {
+				ws = seat_get_last_known_workspace(seat);
+			}
+		} else {
+			target_sibling = node->sway_container;
+		}
+	}
 
 	view->foreign_toplevel =
 		wlr_foreign_toplevel_handle_v1_create(server.foreign_toplevel_manager);
@@ -749,13 +768,6 @@ void view_map(struct sway_view *view, struct wlr_surface *wlr_surface,
 	wl_signal_add(&view->foreign_toplevel->events.destroy,
 			&view->foreign_destroy);
 
-	// If we're about to launch the view into the floating container, then
-	// launch it as a tiled view in the root of the workspace instead.
-	if (target_sibling && container_is_floating(target_sibling)) {
-		target_sibling = NULL;
-		ws = seat_get_last_known_workspace(seat);
-	}
-
 	struct sway_container *container = view->container;
 	if (target_sibling) {
 		container_add_sibling(target_sibling, container, 1);