Editor expand: revert back to scrolling to the editor top when switching Visual to Text, fixes #29338
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4.0-RC3.

Built from https://develop.svn.wordpress.org/trunk@29699


git-svn-id: http://core.svn.wordpress.org/trunk@29474 1a063a9b-81f0-0310-95a4-ce76da25c4cd