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Prevent multiple identical `img` tags in a block of content causing the `wp_content_img_tag` filter to fire multiple times for that image. Follow up to [53028]. Props superpoincare, flixos90, pbearne, peterwilsoncc. Fixes #55510. See #55347. git-svn-id: https://develop.svn.wordpress.org/trunk@53149 602fd350-edb4-49c9-b593-d223f7449a82