Please describe the problem:
Epiphany 1.6.{3,4} has a menu problem with GTK+-2.6.9 *only* : when I go in the
Bookmarks menu and hilight a bookmark item, the Bookmarks menu is closed (I
don't even have the time to click on a bookmark item). Then all Epiphany menu
items do not work when they are clicked : if I click on File -> Quit, nothing
happens (Epiphany does not quit).

When Epiphany is started from a X terminal, the following messages are displayed
(with GTK+-2.6.6) :

- The first time the bookmark menu is opened and a item is hilighted (not
clicked), Epiphany displays the following messages in the console when the
Bookmark menu is automatically closed :

   (epiphany:3190): GLib-GObject-CRITICAL **: g_object_ref: assertion
`G_IS_OBJECT (object)' failed
   (epiphany:3190): GLib-GObject-CRITICAL **: g_object_unref: assertion
`G_IS_OBJECT (object)' failed
   (epiphany:3190): GLib-GObject-CRITICAL **: g_object_unref: assertion
`G_IS_OBJECT (object)' failed

- Then, when I open the Bookmark menu a second time, I gets the following
message when the Bookmarks menu is closed :

   (epiphany:3206): GLib-GObject-CRITICAL **: g_object_ref: assertion
`G_IS_OBJECT (object)' failed
   (epiphany:3206): GLib-GObject-CRITICAL **: g_object_unref: assertion
`G_IS_OBJECT (object)' failed
   (epiphany:3206): Gtk-CRITICAL **: gtk_window_group_add_window: assertion
`GTK_IS_WINDOW_GROUP (window_group)' failed

Note that it does not happens with GTK+-2.6.8. If I run Epiphany 1.6.{3,4} with
GTK+-2.6.8, everything works like it is used to work. Now, if I upgrade my
system to GTK+-2.6.9 *only* (nothing else gets upgraded), the bug happens. I
have even tried to recompile Epiphany (just in case) against GTK+ 2.6.9, but the
problem is still there. As soon as I downgrade my system to GTK+-2.6.8, Epiphany
works as it is used to work.

I only make these tests with Epiphany 1.6.3 and 1.6.4 : I don't know if previous
or next versions have this behavior.

Steps to reproduce:
Be sure to have Epiphany 1.6.{3,4} and GTK+-2.6.9 :

1) Start Epiphany ;
2) Open the Bookmarks menu ;
3) Hilight a bookmark item (do not activate it by clicking on it).

Actual results:
The bookmark menu is automatically closed and Epiphany menus does not work
anymore. You can not even quit Epiphany with the File -> Quit menu item.

Expected results:
The bookmark menu must not be closed when a menu item is hilighted (obviously,
it should be closed when the menu item is clicked).

Does this happen every time?
Yes, it does.

Other information:
Epiphany is a clean web browser with its well-designed user interface. But you
already know that :)