[Bug 28482] New: ContactCapabilities: signal when contacts' capabilities become unknown

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28482

           Summary: ContactCapabilities: signal when contacts'
                    capabilities become unknown
           Product: Telepathy
           Version: git master
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: tp-spec
        AssignedTo: telepathy-bugs at lists.freedesktop.org
        ReportedBy: mikhail.zabaluev at nokia.com
         QAContact: telepathy-bugs at lists.freedesktop.org


The case when contact capabilities are unknown is distinguished in getters and
attributes of connection interface ContactCapabilities, but there is no way to
signal when precise knowledge of contact's capabilities is lost, e.g. due to
the contact going offline.

Simon's plan to implement such a signal, quoted from #telepathy:

<smcv> the backwards compat path would be to signal all possible caps for
contacts whose real caps were unknown, then immediately signal
ContactCapabilitiesUnknown to say "but actually that was just a guess"

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