fix row consistent movement and focus

src/mango.c

@@ -719,6 +719,7 @@ static struct wlr_scene_tree *
 wlr_scene_tree_snapshot(struct wlr_scene_node *node,
 						struct wlr_scene_tree *parent);
 static bool is_scroller_layout(Monitor *m);
+static bool is_row_layout(Monitor *m);
 static void create_output(struct wlr_backend *backend, void *data);
 static void get_layout_abbr(char *abbr, const char *full_name);
 static void apply_named_scratchpad(Client *target_client);