On my local install, I have an image called "Image:Test.jpg" to which I redirected "Image:Redirect.jpg" to it. I was then able to use "Image:Redirect.jpg" inline, displaying the contents of Image:Test.jpg, despite its listing on the bad image list. It would appear that the wfIsBadImage() check is occurring _before_ redirects are being checked. So the redirect may not be blacklisted, but it's end result is.
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Severity: normal