While the documentation for `add_meta_box()` specifices that `$callback_args` should be an array, this has never been enforced, and we have workarounds in place for when it's passed as something other than an array.
Rather than break sites that are passing unexpected data, we can quietly just allow for it, instead.
Props johnjamesjacoby, birgire.
Fixes#45206.
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The block editor needs to duplicate the classic meta box behaviour, so it can extract the registered meta boxes, and import them into the block editor.
To match the classic editor behaviour as closely as possible, this moves the relevant code from the classic editor, into a new function, so it can be called by both.
Props pento, peterwilsoncc.
Fixes#45172.
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When meta boxes are registered, they can use the `__back_compat_meta_box` and `__block_editor_compatible_meta_box` flags, to show whether this registration just exists for if the classic editor is loaded, and whether this meta box is compatible with the block editor.
When a meta box marks itself as incompatible with the block editor, and `WP_DEBUG` is enabled, a warning will show inside that meta box in the classic editor.
As all core meta boxes have been recreated in the block editor, they can be marked with the `__back_compat_meta_box` flag.
See #45112.
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In the full edit screen, CPTs that have disabled the `publicly_queryable` option will hide the slug field, as it doesn't need to be edited. This change brings the Quick Edit view into line with that behaviour.
Merges [43664] to the 5.0 branch.
Props bhargavmehta, krutidugade.
Fixes#43278.
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When Gutenberg is either not installed, or not activated, only show the callout to users with the `install_plugins` capability.
When Gutenberg is activated, expand that to include all users with the `edit_posts` capability.
4.9 branch commit.
Props pento.
Fixes#44680.
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* Introduce `try_gutenberg_learn_more_link` filter that allows hosts or site owners to change the link, to provide extra information about Gutenberg, specific to their service.
* Only display the "Install" buttons if we're able to directly write to disk to install the plugins.
* Make sure the "Dismiss" link works correctly.
Props pento, andrew.taylor, leemon.
Fixes#41316.
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To encourage folks to prepare for Gutenberg, this new Dashboard box allows site users to easily install and try the Gutenberg plugin now, or to install the Classic Editor plugin before WordPress 5.0 is released.
Props pento, melchoyce, joen, karmatosed, joemcgill, SergeyBiryukov, jorbin, bph, Clorith, afercia, chanthaboune, chrislema, kjellr, matveb, michelleweber.
Fixes#41316.
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