[Pidgin] #14779: Jabber contacts without group info should be handled more gracefully

[Pidgin]

#14779: Jabber contacts without group info should be handled more gracefully
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 Reporter:  amckinley     |     Owner:  rekkanoryo
     Type:  defect        |    Status:  new       
Component:  unclassified  |   Version:  2.10.0    
 Keywords:                |  
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 I discovered this problem when I changed my jabber server to stop
 returning any group info in the roster. When adium has no groups for a
 jabber contact, it falls back to putting them in the last-known group they
 were a member of, based on the contents of blist.xml. Passing an empty
 group tag (<group />) causes adium to put the contact in the default
 Buddies list, which appears to be the only way to avoid this behavior.

 I talked to zac about this in #adium, and he thinks the problem is here:
 http://developer.pidgin.im/viewmtn/revision/file/e1dd2131481956783d4d7f4c23da4bcc1c8f0e52/libpurple/protocols/jabber/roster.c

 add_purple_buddy_to_groups() should do something smarter to detect that a
 contact has moved from a group to the default group, instead of putting
 the contact back in the original group.

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Ticket URL: <http://developer.pidgin.im/ticket/14779>
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