[Bug 37078] crashes if connecting fails just before it succeeds

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=37078

--- Comment #1 from Simon McVittie <simon.mcvittie at collabora.co.uk> 2011-05-10 11:14:21 PDT ---
Created an attachment (id=46559)
 View: https://bugs.freedesktop.org/attachment.cgi?id=46559
 Review: https://bugs.freedesktop.org/review?bug=37078&attachment=46559

set_status_to_connected: do nothing if we already  disconnected

Now that we're making more use of GAsyncResult, we can easily get into
this situation:

* all but one of the preconditions for being CONNECTED have happened;
  the remaining one uses GAsyncResult (currently that can only be
  conn_presence_set_initial_presence_async)

* conn_presence_set_initial_presence succeeds, and schedules a call
  to its callback in an idle; we are now ready to be CONNECTED, but because
  of GAsyncResult calling conventions, we won't call the callback right now

* someone calls Disconnect(), and we do so, synchronously; we are now
  DISCONNECTED

* the idle goes off and connection_initial_presence_cb is called,
  with success, while DISCONNECTED!

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