Jonathan Desrosiers e318383bd0 Block Editor: Add a placeholder for meta boxes that don't work in the block editor.
If a meta box is registered with the `__block_editor_compatible_meta_box` set to `false`, it's indicating that it doesn't work in the block editor. If that's the case, we can add a place holder to inform the user that they'll need to use the classic interface to work with this meta box.

Props pento, jorgefilipecosta, peterwilsoncc, karmatosed, noisysocks, dd32, ocean90.

Merges [43941] and [43945] to trunk.

Fixes #45217.

git-svn-id: https://develop.svn.wordpress.org/trunk@44280 602fd350-edb4-49c9-b593-d223f7449a82
2018-12-17 21:51:43 +00:00
2017-11-30 23:09:33 +00:00
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