Comment 152 for bug 219385

(In reply to Martin Stránský from comment #129)
> Yeah. gtk_handle_box_paint draws gtk_render_handle() differently,
> regards to the handle_position. But the effective_handle_position() (from
> gtk_handle_box_paint) uses GtkHandleBoxPrivate which seems to be
> hidden/private.

The old gtk2drawing code was apparently only painting the box and not the handle.
i.e. it didn't call gtk_paint_handle.

So perhaps we should drop the gtk_render_handle from moz_gtk_gripper_paint to match that. I don't know where or if this is actually used.