[Pidgin] #8644: API shouldn't include `purple_blist_get_buddies`

[Pidgin]

#8644: API shouldn't include `purple_blist_get_buddies`
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 Reporter:  darkrain42   |           Owner:  datallah
     Type:  enhancement  |          Status:  new     
Component:  Bonjour      |         Version:          
 Keywords:               |   Launchpad_bug:          
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 I don't see a valid use-case for exposing purple_blist_get_buddies. The
 key is an opaque structure, so the only use seems to be for iterating over
 every buddy in the list

 The bonjour plugin seems to use this to map IP to !PurpleBuddy, but a
 dedicated hash table there seems much saner.

 As a replacement API, I'd propose purple_blist_get_buddies return a
 GSList* (freed by caller) of all the buddies in the list.

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Ticket URL: <http://developer.pidgin.im/ticket/8644>
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