Dominik Schilling 2603a8b4d6 TinyMCE: Improve the previews for shortcodes.
Merge of [41395] to the 4.4 branch.

Built from https://develop.svn.wordpress.org/branches/4.4@41439


git-svn-id: http://core.svn.wordpress.org/branches/4.4@41272 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2017-09-19 12:43:37 +00:00
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