[Telepathy] ANNOUNCE: telepathy-spec 0.17.12

[Simon McVittie]

I've just uploaded telepathy-spec 0.17.12, the "drilling holes in walls"
release.

The current development version of telepathy-spec is available as HTML:
  <http://telepathy.freedesktop.org/spec.html>
or from the 'master' branch in the git repository:
  <git://git.collabora.co.uk/git/telepathy-spec.git>
  <git+ssh://git.collabora.co.uk/git/telepathy-spec.git> (for committers)
  <http://git.collabora.co.uk/?p=telepathy-spec.git> (gitweb)

For packagers (e.g. http://packages.debian.org/telepathy-spec):
tar: http://telepathy.freedesktop.org/releases/telepathy-spec/telepathy-spec-0.17.12.tar.gz
sig: http://telepathy.freedesktop.org/releases/telepathy-spec/telepathy-spec-0.17.12.tar.gz.asc

New API:

* Added EnsureChannel to the Requests interface. This returns an existing
  channel if possible, or creates a new channel otherwise; it also makes
  sure that only one caller considers itself to be responsible for
  dispatching or handling the new channel.

* Added new errors Cancelled and NotYours to support the ChannelDispatcher.

* Added a Forwarded flag to Channel.Interface.CallState

New experimental API:

* Added the Client and ChannelDispatcher machinery. The ChannelDispatcher
  is a central service dependent on the AccountManager (in practice, it will
  usually be in the same process) which provides functionality for requesting
  channels, and is also responsible for dispatching channels to appropriate
  clients. The Client interface is used to discover appropriate clients.

  When finished, this will supersede the ChannelHandler interface for clients,
  and Mission Control 4's D-Bus API.

* Added a Destroyable interface so the channel dispatcher has a way to
  kill off unhandleable channels (e.g. if we don't have a Text UI for some
  reason)

Miscellaneous:

* doc/*.txt contain various thoughts about use cases for new functionality,
  which provide further rationale for why the ChannelDispatcher is so
  complicated :-)

Regards,
    Simon
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