Jb Audras e258cac7bc Media: Make get_post_galleries() only return galleries.
This change makes sure only gallery content is returned by `get_post_galleries()`. It fixes an issue where non gallery block content was also returned by the function.

Props BinaryMoon, costdev, glendaviesnz.
Merges [52797] to the 5.9 branch.
Fixes #55203.


git-svn-id: https://develop.svn.wordpress.org/branches/5.9@53006 602fd350-edb4-49c9-b593-d223f7449a82
2022-03-28 20:51:00 +00:00
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