User "NeilK" posted a comment on MediaWiki.r92200.

Full URL: http://www.mediawiki.org/wiki/Special:Code/MediaWiki/92200#c20043
Commit summary:

fixed a condition where re-uploading a file that's already stashed causes 
breakage.  This mirrors the previous session-based behavior as closely as 
possible.

Comment:

I don't understand, under what conditions can this problem occur?

There is not supposed to be any check for uniqueness of file contents in the 
UploadStash. As you mentioned it is very likely to get re-uploads, even from 
multiple people, and this is not necessarily a mistake at this stage.

Files just need to have unique names and generally the unique name is set by 
the API client anyway, and if not you have a good function to create a unique 
name. 

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