[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       |       Type:  enhancement
   Status:  new           |   Priority:  minor      
Component:  pidgin (gtk)  |    Version:  2.0.2      
 Keywords:                |    Pending:  0          
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 I was just monitoring my system for unnecessary disk spin-ups on my
 laptop, with laptop modo. So far, pidgin is behaving quite nicely, but one
 thing is causing spin-ups:

 I have my buddies sorted by log size (great feature BTW!). Now whenever
 someone logs on, pidgin stats all log files for that buddy to calculate
 the total log size, which causes the disk to spin up (unless these inode
 are already cached, which is unlikely, as the buddy just logged on).

 My suggestion is to keep the log size count in `blist.xml`, similar to the
 signedon and similar fields. It could be increased each time a
 conversation is ended (not with each message, as that would cause too many
 `blist.xml` writes I guess), and filled it the first time it is needed but
 not available. This would reduce the disk read usage of pidgin noticeably.

 What do you think?

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