https://bugs.webkit.org/show_bug.cgi?id=95618

Patch by Mario Sanchez Prada <msanchez@igalia.com> on 2012-09-04
Reviewed by Martin Robinson.

Source/WebCore:

Make sure we only emit the the signal for menu lists and list
boxes rendered from actual HTML select elements.

* accessibility/gtk/AXObjectCacheAtk.cpp:
(WebCore::notifyChildrenSelectionChange): We support accessibility
ListBoxes and MenuLists only here, assuming they represent HTML
select elements, which might be not always true (e.g. ARIA). Thus,
check if that condition is true, early returning in other case.

LayoutTests:

New layout test to ensure we don't crash with ATK notifications
anymore when changing the selection in an ARIA listbox.

* platform/gtk/accessibility/aria-listbox-crash-expected.txt: Added.
* platform/gtk/accessibility/aria-listbox-crash.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@127466 268f45cc-cd09-0410-ab3c-d52691b4dbfc