This will be the final sync from GitHub before placing that repository into read-only mode. All further changes should now flow entirely through Trac.
For a full list of changes since [49633], see 1d5a895...53acd9b.
Props poena, luminuu, kjellr, ryelle, allancole, melchoyce, felipeelia, aljullu, kebbet, chaton666, Clorith, mkaz, ingereck, paaljoachim.
Reviewed by desrosj, SergeyBiryukov.
Merges [49726] to the 5.6 branch.
Fixes#51526.
Built from https://develop.svn.wordpress.org/branches/5.6@49728
git-svn-id: http://core.svn.wordpress.org/branches/5.6@49451 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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