[gtk+/gtk-2-24] Fix updating the widget accessible description when using its tooltip

[Matthias Clasen <matthiasc src gnome org>]

commit 61d5c82f5ca7d4f00f8182d17d30c350f43a4424
Author: Colomban Wendling <cwendling hypra fr>
Date:   Mon Feb 20 11:29:10 2017 +0100

    Fix updating the widget accessible description when using its tooltip
    
    We need to notify ATK the description changed when the tooltip text
    associated with the widget changes and gail_widget_get_description()
    would use it as the description.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=779009

 modules/other/gail/gailwidget.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/modules/other/gail/gailwidget.c b/modules/other/gail/gailwidget.c
index b700b29..752888a 100644
--- a/modules/other/gail/gailwidget.c
+++ b/modules/other/gail/gailwidget.c
@@ -983,6 +983,12 @@ gail_widget_real_notify_gtk (GObject     *obj,
      * focus changes so we ignore this.
      */
     return;
+  else if (atk_obj->description == NULL &&
+           strcmp (pspec->name, "tooltip-text") == 0)
+    {
+      g_object_notify (G_OBJECT (atk_obj), "accessible-description");
+      return;
+    }
   else if (strcmp (pspec->name, "visible") == 0)
     {
       state = ATK_STATE_VISIBLE;