Weston Ruter 2b81ceddf9 Customize: Prevent previewer from appearing to freeze when refreshing too fast.
Fixes race condition issue where a previous iframe fails to get destroyed, leaving a iframe pending loading persistently shown.

Props nikeo, westonruter.
Fixes #38728.

Built from https://develop.svn.wordpress.org/trunk@39199


git-svn-id: http://core.svn.wordpress.org/trunk@39139 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-10 22:43:32 +00:00
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