[gtk+/native-layout] Clarify the docs for gtk_info_bar_set_default_response

[Tristan Van Berkom <tvb src gnome org>]

commit f90b880ce8cf7fd0f716842b4c267fbc8ba972a8
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Feb 23 11:13:16 2010 -0500

    Clarify the docs for gtk_info_bar_set_default_response
    
    According to bug 610632

 gtk/gtkinfobar.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkinfobar.c b/gtk/gtkinfobar.c
index 9de968f..b25df2c 100644
--- a/gtk/gtkinfobar.c
+++ b/gtk/gtkinfobar.c
@@ -956,6 +956,9 @@ gtk_info_bar_set_response_sensitive (GtkInfoBar *info_bar,
  * the given response_id as the default widget for the dialog.
  * Pressing "Enter" normally activates the default widget.
  *
+ * Note that this function currently requires @info_bar to
+ * be added to a widget hierarchy. 
+ *
  * Since: 2.18
  */
 void