[Pidgin] #2027: Cache log size history for buddy list sorting

[Pidgin]

#2027: Cache log size history for buddy list sorting
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  Reporter:  nomeata    |       Owner:  rlaager
      Type:  defect     |      Status:  new    
  Priority:  minor      |   Milestone:         
 Component:  libpurple  |     Version:  2.0.2  
Resolution:             |    Keywords:         
   Pending:  0          |  
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Comment (by nomeata):

 Replying to [comment:8 mshkutkov]:
 > AFAIK, we recalculate log size when buddy appears in buddies list. It
 doesn't matter online or offline buddy and may happens at any time (for
 example after choosing "Show offline buddies")

 This might be undesirable if the user is running on battery with the disk
 spun down. How about making the cache permanent again, e.g. in the
 blist.xml or a file on it’s own? Or alternatively, reading in all log
 sizes (even for those buddies that are not displayed) on program start?

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Ticket URL: <http://developer.pidgin.im/ticket/2027#comment:9>
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