Manual:$wgFileRedirects

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Files and file uploads: $wgFileRedirects
If enabled, MediaWiki checks redirects in File: namespace.
Introduced in version:1.12.0 (r29870)
Removed in version:1.13.0
Allowed values:(boolean)
Default value:false

DetailsEdit

If enabled, MediaWiki checks redirects in File: namespace.

Enabled unconditionally in 1.13.