1. An external contribution changed the ordering of views for
accessibility. While it attempted to fix a platform issue
for a comparator breaking transitivity, it changed the way
we order views and results in very unnatural accessibility
traversal order. It also broke CTS tets. This change tweaks
the comparator which fixes the tests and improves traversal
order.
2. If there is at least one accessibility service which cares
about windows we register a callback in the window manager
for window change notifications. We are updating the window
list on this callback. There was a case where if the service
requests window updates and immediately asks for the windows
it gets none as we have not received a callback from the
window manager yet. Now this call returns after we get the
callback in a timed fashion. This is consistent with how the
other introspection APIs work.
3. Window info objects are cached in the accessibility service
process. When putting them in the cache a cloning call was
missing resulting in some cases of clobbering windows given
to the client. For example, we get some windows, cache them,
and return these windows to the client. Now a call to clear
the cache arrives while the user processes the windows and
the client windows get clobbered.
4. Added API for checking if a window has accessiblity focus
to be consistent to the API we have to check whether this
window has input focus.
5. Removed some obsolete code.
bug:16402352
Change-Id: Ided6da4a82cc0fc703008c58a2dff0119a3ff317
04cab1bcc4