Joe McGill 0569c6219e Post Thumbnails: Prevent post thumbnail previews from spilling into other images. ...

After [38118], when previewing a page with a secondary loop, all post
thumbnails would be filtered to display the post thumbnail for the
page being previewed. This ensures `_wp_preview_post_thumbnail_filter()`
is only applied if the `$post_id` of the post meta being filtered is
equal to the post or page being previewed.

Props swisspidy, joemcgill.
Fixes #37697.
Built from https://develop.svn.wordpress.org/trunk@38433


git-svn-id: http://core.svn.wordpress.org/trunk@38374 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2016-08-29 12:25:29 +00:00

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