Don't add extra spaces to classes. It causes some tests in the TinyMCE QUnit test suite to fail. Fixes #31764. Built from https://develop.svn.wordpress.org/trunk@32592 git-svn-id: http://core.svn.wordpress.org/trunk@32562 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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