[wp-trac] [WordPress Trac] #4138: Add to cache rather than set cache when data not changed

[WordPress Trac]

#4138: Add to cache rather than set cache when data not changed
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 Reporter:  ryan            |       Owner:  ryan 
     Type:  defect          |      Status:  new  
 Priority:  low             |   Milestone:  2.1.4
Component:  Administration  |     Version:  2.2  
 Severity:  normal          |    Keywords:  cache
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 There are several places where we should be using wp_cache_add instead of
 wp_cache_set to save unnecessary cache writes.

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Ticket URL: <http://trac.wordpress.org/ticket/4138>
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