This method returns null when $mime is 'unknown/unknown' and the file
extension is unknown to MediaWiki. The inline documentation and @return
annotation omitted this.
I don't think this was an intentional design choice, but it's the
existing behavior and I'm not sure it's safe to change.
Since it is the existing behavior, document it and add a test case, to
ensure that any changes to this behavior are intentional.
Bug: T253483
Change-Id: Ie6615a4bd9ae77e9ab59cfe76edb237cace693b1
* FSFile should not be responsible for handling this much logic.
* Make more MediaHandler classes aware of the fact that an object
other than File might be passed in. Use the FSFile instead of a
useless empty stdClass object.
* Also added more fields to FSFile::placeholderProps to make it
more complete.
Change-Id: I9fe764b2a7261af507c6555e6a57273cf7d00d36
