When autosaving a new post for the first time after a title was typed, cancel the autosave if the user is submitting the form. (Includes a precommit fix for customize-controls.css.) Props Nessworthy, davidmarichal, fixes #27657
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git-svn-id: http://core.svn.wordpress.org/trunk@27781 1a063a9b-81f0-0310-95a4-ce76da25c4cd