[Webkit-unassigned] [Bug 38648] New: Ensure DRT loads GAIL (Gtk+ module), for a11y tests

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=38648

           Summary: Ensure DRT loads GAIL (Gtk+ module), for a11y tests
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: msanchez at igalia.com


After some investigation while working for fixing bug 31018, I found that the
AtkObject* returned by AccessibilityController::rootElement() -in
AccessibilityControllerGtk.cpp- is *not a valid AtkObject* at all
(ATK_ROLE_INVALID), which makes impossible to later access to its only child
and therefore any AccessibleUIElement associated to the DOM's elements.

As a consecuence of this, it was not possible to implement the isSelected()
method in DRT to make the accessibility/aria-controls-with-tabs.html test
success, as it was not possible to access to any AccessibleUIElement in the DOM
starting from the root element.

After some investigation I found the problem was that the GAIL Gtk module was
not being loaded along with the execution of DRT (even if the environment
variable was already set), and that's the reason behind those AtkObjects
returned by rootElement() not being valid.

Therefore, we need to make sure GAIL is always loaded with DRT if we want this
kind of a11y tests (using the AccessibleUIElements starting from the root
element) work properly.

As side note: it seems that some a11y apps like Orca and Accerciser manually
make sure the GTK_MODULES envvar is properly loaded along with their
executions, so perhaps that's the way to go here, providing it would only
affect to the GTK implementation of the DRT.

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