Install: Allow an installation to go through with a custom user table with the username 'admin'.

This could be better, but this solves the regression caused by [25115].

fixes #27093, see #24078.

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The `sidebar_admin_setup` hook should only be documented once in wp-admin/widgets.php. All others are duplicates.

See #25374, #25501, #27531.

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Widget Customizer: Remove some specific styles for Widget Visibility from Jetpack.

This hasn't worked well and is now fixed upstream.

props westonruter.
see #27112.

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Inline documentation for hooks in wp-includes/pluggable.php.

Props kpdesign for some cleanup.
Fixes #26888.

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Inline documentation for hooks in wp-includes/class.wp-styles.php.

Props lkwdwrd.
Fixes #27445.

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Inline documentation for hooks in wp-includes/taxonomy.php.

Props kpdesign for some minor language tweaks.
Fixes #27505.

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Inline documentation for hooks in wp-includes/class-wp-editor.php.

Props kpdesign for some cleanup.
Fixes #27523.

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Updated `2.14.0` build from the project maintainer.

See #27570.


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Theme Installer: Caching and paginating of API requests.

props matveb.
see #27055.

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Fix styling for mce-path (at the bottom of the editor), see #26952
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