Manual:$wgCountCategorizedImagesAsUsed

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Special pages: $wgCountCategorizedImagesAsUsed
On Special:Unusedimages, consider images "used" if they are put into a category.
Introduced in version:1.4.1
Removed in version:still in use
Allowed values:(boolean)
Default value:false

Details

On Special:Unusedimages, consider images "used" if they are put into a category. Default (false) is not to count those as used.