[gtk+/gtk-3-18] GtkListBox: get_row_at_y can return NULL

[Matthias Clasen <matthiasc src gnome org>]

commit 4bf28f8a3bf0813e785d7ecea8f7e817baee4e08
Author: Timm Bäder <mail baedert org>
Date:   Wed Jan 6 10:46:29 2016 +0100

    GtkListBox: get_row_at_y can return NULL

 gtk/gtklistbox.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtklistbox.c b/gtk/gtklistbox.c
index 2dbe0cd..56d56b5 100644
--- a/gtk/gtklistbox.c
+++ b/gtk/gtklistbox.c
@@ -677,7 +677,8 @@ gtk_list_box_get_row_at_index (GtkListBox *box,
  *
  * Gets the row at the @y position.
  *
- * Returns: (transfer none): the row
+ * Returns: (transfer none) (nullable): the row or %NULL
+ *   in case no row exists for the given y coordinate.
  *
  * Since: 3.10
  */