Consistently return a WP_Error object in case of an error in wp_update_nav_menu_item().

props bootsz, ocean90.
fixes #21652.
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Prevent large images in comments from overflowing the meta box.

props mattheu.
fixes #26643.
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Force UTF-8 in load-styles.php, like we do in load-scripts.php.

props iamfriendly, mjbanks.
fixes #25012.
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Fix the tags input in small viewports and make it a more reasonable size. props SergeyBiryukov. fixes #27082.

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Inline documentation for hooks in wp-admin/includes/class-wp-posts-list-table.php.

Props nicolealleyinteractivecom, kpdesign.
Fixes #26397.

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