Created attachment 17394 [details] [review]
Proposed patch

Marking AP2 to reflect a11y team's assessment of a11y impact.

We *never* use object data as part of the public API

Apologies for spam... marking as GNOMEVER2.3 so it appears on the official GNOME
bug list :)

I'd probably do this as a straightforward API like:

 gtk_tooltips_get_info_from_tip_window (GtkWindow    *tip_window,
                                        GtkTooltips **tooltips,
                                        GtkWidget   **current_widget);

Created attachment 21000 [details] [review]
Updated patch

review of patch requested for gtk+ 2.4.  This blocks implementation of
a desirable and significant (but possibly non-essential) ATK/gail feature.

* Needs documentation, including a warning that this should
  not be used by applications.

* Function needs a g_return_if_fail (GTK_IS_WINDOW (tip_window))

* The function segfaults if called on a window that isn't
  from GtkTooltips; since there's no way of finding out if
  a window is from GtkTooltips, this seems bad :-)
  I'd probably add a boolean return value with FALSE if  
  the window isn't from GtkTooltips; in that case, though
  it's still nice to NULL out the two out parameters.

* I don't like reusing the key like that, the name GtkTooltipsData
  is a specific reference to the GtkToolTipsData structure

Otherwise, looks OK to me.

Ok, I went ahead and committed the patch with the changes outlined by
owen, and with docs.