User "Mdale" posted a comment on MediaWiki.r98710.

Full URL: http://www.mediawiki.org/wiki/Special:Code/MediaWiki/98710#c26010
Commit summary:

Follow-up r84395: Give MediaHandlers the option to remove items from the 
thumbnail purge list. Is needed for TMH because thumbnail rendering may be very 
expensive for media files. Haven't thought yet of a way to integrate this with 
the UI, but the current framework should be flexible enough to implement that 
later.

Added array $options to File::purgeCache(), LocalFile::purgeCache(), 
LocalFile::purgeThumbnails(), ForeignAPIFile::purgeCache() and 
ForeignAPIFile::purgeThumbnails() which is currently empty, but can be used 
later to indicate a full or partial purge.
Added MediaHandler::filterThumbnailPurgeList(), which can remove items from the 
purge list and also gets passed this $options array

Comment:

I see this was reverted? Why would the above code result in thumbnails not 
being purged on deletion? 

What is the current solution for avoiding the removal of expensive to generate 
thumbnails ( ie video transcodes ) on simple action=purge page requests ?  

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