A first experimental conversion from the gail namespace to gtkaccessible.
At the same time, use gtk_widget_class_set_accessible_type() to register
the accessible type for GtkLabel.
Avoid many unnecessary list iterations by using a hash table
to store cell infos, and caching row and column counts. Based
on patches by William Jon McCann, bug 554171.
tree-performance results:
before: (MINPERF:large tree test with a11y: 9.18531sec)
after: (MINPERF:large tree test with a11y: 0.923463sec)
for comparison, without accessibility:
(MINPERF:large tree test: 0.016179sec)
As set_description is never called and unsupported by the at-spi, we can
omit implementing it.
This means we can also omit get_description calls in various places, as
they'd just return the default value: NULL.
This code was supposed to work around a bad interaction between GOK and
Nautilus from 7 years ago.
If it still exists, the GOK developers may complain to the Nautilus
developers.
https://bugzilla.gnome.org/show_bug.cgi?id=137401
It is now no longer possible to disable it.
This doesn't matter though because GTK will not instantiate a11y
objects until you actually use it. So nothing changes in practice.
