[Pidgin] #11667: Add 12 hour timestamps to Message Timestamp Formats plugin

[Pidgin]

#11667: Add 12 hour timestamps to Message Timestamp Formats plugin
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 Reporter:  jemaltz                        |        Owner:         
     Type:  patch                          |       Status:  new    
Milestone:  Patches Needing Improvement    |    Component:  plugins
  Version:  2.6.6                          |   Resolution:         
 Keywords:  timestamp format 12hr 12 hour  |  
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Comment(by darkrain42):

 I would say to try to keep it simple and do the migration once and leave
 the old value as-is (don't change it at all).  If the new preference
 doesn't exist, migrate from the old value to the new setting.

 It's imperfect, but straightforward from a code perspective.

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Ticket URL: <http://developer.pidgin.im/ticket/11667#comment:3>
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