Reviewed by Martin Robinson.

        [Gtk] atk_text_get_selection/atk_text_set_selection fails for list items
        https://bugs.webkit.org/show_bug.cgi?id=53453

        Ensure that atk_text_{get|set}_selection() work with list items.

        * accessibility/gtk/AccessibilityObjectWrapperAtk.cpp:
        (webkit_accessible_text_get_text): Properly handle list item
        markers when returning the text for an object for a given interval
        specified through the startOffset and endOffset parameters.
        (getSelectionOffsetsForObject): Bear in mind list item markers
        when returning the offsets for a selection over a list item.
        (webkit_accessible_text_set_selection): Adjust offsets if needed
        for list items with item markers. Ensure that it returns TRUE only
        when everything went fine setting the text selection.
2011-02-18  Mario Sanchez Prada  <msanchez@igalia.com>

        Reviewed by Martin Robinson.

        [Gtk] atk_text_get_selection/atk_text_set_selection fails for list items
        https://bugs.webkit.org/show_bug.cgi?id=53453

        Update unit test to check the fix for this bug.

        * tests/testatk.c:
        (testWebkitAtkTextSelections): Check that functions from AtkText
        interface to set and get text selections work with list items.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@78978 268f45cc-cd09-0410-ab3c-d52691b4dbfc