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In part of a larger review of CSS semantics and behaviors, this patch takes the opportunity to remove leading whitespace in an updated class attribute after the first class in the attribute has been removed. Previously, if the first class name had been removed, the whitespace that formerly followed it would remain in the class attribute. This stood in contrast to removing other class names, which removed their associated whitespace. There should be no semantic or functional changes in this patch, only a slightly-large diff for modified HTML documents that looks prettier when removing the first class name in a class attribute. Developed in https://github.com/WordPress/wordpress-develop/pull/6933 Discussed in https://core.trac.wordpress.org/ticket/61531 Props dmsnell, jonsurrell. See #61531. git-svn-id: https://develop.svn.wordpress.org/trunk@58740 602fd350-edb4-49c9-b593-d223f7449a82