* @tree_view: A #GtkTreeView
* @x: The x position to be identified (relative to bin_window)
* @y: The y position to be identified (relative to bin_window)
- * @path: (out) (allow-none): A pointer to a #GtkTreePath pointer to be filled in, or %NULL
- * @column: (out) (allow-none): A pointer to a #GtkTreeViewColumn pointer to be filled in, or %NULL
- * @cell_x: (out) (allow-none): A pointer where the X coordinate relative to the cell can be placed, or %NULL
- * @cell_y: (out) (allow-none): A pointer where the Y coordinate relative to the cell can be placed, or %NULL
+ * @path: (out) (optional) (nullable): A pointer to a #GtkTreePath pointer to
+ * be filled in, or %NULL
+ * @column: (out) (transfer none) (optional) (nullable): A pointer to a
+ * #GtkTreeViewColumn pointer to be filled in, or %NULL
+ * @cell_x: (out) (optional): A pointer where the X coordinate relative to the
+ * cell can be placed, or %NULL
+ * @cell_y: (out) (optional): A pointer where the Y coordinate relative to the
+ * cell can be placed, or %NULL
*
* Determine whether the point (@x, @y) in @tree_view is blank, that is no
* cell content nor an expander arrow is drawn at the location. If so, the