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Fix inverted redirect-taint check for COEP: credentialless - #1959
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The check was introduced in 0613515 as "request's tainted origin flag is not set" and converted in 5dc54a7 to "request does not have a redirect-tainted origin". The conversion to the redirect-taint tri-state in 1d9380b dropped the negation's meaning, making "Cross-Origin-Embedder-Policy allows credentials" return true precisely when the request had been redirect-tainted, rather than when it had not. Fixes #1958.
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The check was introduced in 0613515 as "request's tainted origin flag is not set" and converted in 5dc54a7 to "request does not have a redirect-tainted origin". The conversion to the redirect-taint tri-state in 1d9380b dropped the negation's meaning, making
"Cross-Origin-Embedder-Policy allows credentials" return true precisely when the request had been redirect-tainted, rather than when it had not.
Fixes #1958.