'sanitize_user' is a filter, not an action. fixes #25411.
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Simplify the login page viewport meta for mobile devices, so it's less restrictive on the user. Allows for developers to override if necessary via the `login_head` action. props azaozz. fixes #24777.

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Better error messaging on install.php. props DrewAPicture, ocean90. fixes #24982.

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Live network counts of users and sites for small networks.

props adamsilverstein, jeremyfelt.
fixes #22917.

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Only show top-level items when adding pages to a User's First Nav Menu. (This is also the title of Dave's first children's book.)

props lessbloat.
fixes #25122.

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Twenty Fourteen: change the background color a bit more on hover for main navigation submenus. See #25220.
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Twenty Fourteen: make the content sidebar optional and alter the layout to full-width if the sidebar is not active, but without adding wider featured image (for now). Props iamtakashi, closes #25031.
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Twenty Eleven: update code comments to reflect WP inline docs standards. Props DrewAPicture, see #25256.

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Twenty Twelve: simplify header image check, props obenland. Closes #25400.
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Twenty Ten: update code comments to reflect WP inline docs standards. Props DrewAPicture, closes #25256.
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Improve inline documentation for `wp_insert_post()` by adding a hash notation.

See #25412.

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Add a `user_new_form` hook, with context. props johnjamesjacoby, strangerstudios, jeremyfelt, DrewAPicture. fixes #18709.

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

Props naomicbush.
Fixes #25357.

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Remove the new user_new_form hook from the network admin, pending further review. see #18709.

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Order search results by relevance, rather than by date.

The ordering logic is as follows:
 * Full sentence matches in post titles.
 * All search terms in post titles.
 * Any search terms in post titles.
 * Full sentence matches in post content.

Each section and any remaining posts are then sorted by date.

Introduces some filters:
 * wp_search_stopwords, to filter stop words ignored in WHERE.
 * posts_search_orderby, to filter the ORDER BY when ordering search results.

props azaozz, wonderboymusic.
fixes #7394.

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Changes to automatic background updates in preparation for Beta 1.

 * Show a notice for beta testers on update-core.php explaining the status of their install. Three possibilities: auto updates are enabled, auto updates are disabled because the install doesn't support SSL HTTP requests, and auto updates are disabled because it is a VCS checkout.
 * Improve the output of the email, for maximum debugging potential. Failures are clearly labeled and the email leads testers to the support forums and Trac.
 * Try to create wp-content/languages in the upgrader if it doesn't exist. Our mkdir isn't recursive, so trying to create wp-content/languages/plugins could fail.
 * Abstract out version control checkout determination into a public method. The filter is now auto_upgrade_is_vcs_checkout, still subject to change.

see #22704.

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Filters for locale in wp_update_plugins() and wp_update_themes(). see #18200.

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Fix strict notice. see #22704.

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Fix non-square rotations when using the Imagick image editor.

props DH-Shredder.
fixes #22663.

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Expand the zxcvbn password meter blacklist, based on user input.

props iandunn.
see #25174.

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