[Pidgin] #13542: expose function via dbus to get 'unseen-count'

[Pidgin]

#13542: expose function via dbus to get 'unseen-count'
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 Reporter:  badboy_          |       Owner:
     Type:  enhancement      |      Status:  new
Milestone:  Patches welcome  |   Component:  libpurple
  Version:                   |  Resolution:
 Keywords:  dbus unseen      |
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Comment (by thomaslee):

 On closer inspection, I can see exactly why the suggestion was to
 implement this as a DBus wrapper function: purple itself has no notion of
 unseen-count. This is set in the conversation data by Pidgin.

 I'm going to go ahead & implement it as a wrapper function as suggested.

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Ticket URL: <https://developer.pidgin.im/ticket/13542#comment:10>
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