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Plugin: Deprecate metabox supports, fall back to core #13449
This pull request seeks to remove the Gutenberg-specific meta box compatibility functions, instead deferring to those shipped with WordPress 5.0.
The most tricky bit here is that we need the Gutenberg editor screen to claim itself as being the block editor, i.e.
From what I can gather, outside meta boxes, this impacts:
Verify that there are no regressions in the display and saving of meta boxes.