Dominik Schilling 441a970ecd TinyMCE: Improve the previews for shortcodes.
Merge of [41395] to the 4.6 branch.

Built from https://develop.svn.wordpress.org/branches/4.6@41437


git-svn-id: http://core.svn.wordpress.org/branches/4.6@41270 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2017-09-19 12:42:38 +00:00
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