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This fixes an oversight in [39246], which added a hook for filtering the array of sizes used for PDF thumbnails, but failed to provide a way for sizes added through `add_image_size()` to be processed. Merge of [39617] to the 4.7 branch. Props gitlost. Fixes #39231. See #38594. Built from https://develop.svn.wordpress.org/branches/4.7@39633 git-svn-id: http://core.svn.wordpress.org/branches/4.7@39573 1a063a9b-81f0-0310-95a4-ce76da25c4cd