Heartbeat: update wp-auth-check to use the new "connectNow()" method after a successful login, see #25073.
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For the current theme, display all available actions, as dictated by the admin menu.

Restores 3.7 behavior. This could include things like Header and Background as well as theme options pages.

see #25948.

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Reset responsive styles for the checkbox in auth check window.

props iammattthomas.
fixes #26360.
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Add basic responsive styles for button-small and button-large, override responsive button-large styles when used in the .interim-login iframe. Fixes #26363.
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Simplify the color scheme profile saving JS. see #25858.

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Restyle .sub text and .mu-storage header to match new admin design conventions. Fixes #26357.
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Only informally deprecate get_screen_icon() and screen_icon(). fixes #26119.

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Inline documentation for hooks in wp-includes/ms-functions.php.

Props ShinichiN, ericlewis, rzen.
Fixes #25598.

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Better visual alignment on side-sortables tabs. Fixes #26323, props mattheu.
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Inline documentation for hooks in wp-admin/includes/update.php.

Props stevenkword for the initial patches.
Fixes #26252.

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Remove @uses from get_screen_icon() / screen_icon(). see #26119.

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Customizer: Ensure we have a string that's JSON parseable.

props mattwiebe.
fixes #postmessage-check.diff.

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Return false from wp_delete_post() and wp_delete_attachment() if the DELETE is unsuccessful.

This prevents attachments from being deleted off disk when a DB is locked and the delete is otherwise unsuccessful.

fixes #25107.

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Be specific in term_exists error messages in wp_insert_term() as to what already exists (name, or name and slug).

props ericmann, SergeyBiryukov.
fixes #15741.

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Twenty Fourteen: use a more specific selector for tag links.

props iamtakashi.
fixes #26358.
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Add dashicons CSS classes for easy access by plugins and themes.

props dd32.
fixes #26227.

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Customizer: Don't trigger a change event if two unchanged object values are equal.

In JavaScript: `{"title":"Foo"} !== {"title":"Foo"}`
Underscore.js provides an isEqual function to compare two values to see if they have the same contents, which can be use instead.
Because only one function of Underscore.js is needed we just add a copy of `_.isEqual` to customize-base.js.

props westonruter.
fixes #26061.
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Heartbeat:
- Bring back heartbeat.interval().
- Rename wp_disable_heartbeat_suspend() to wp_heartbeat_set_suspension().
- Rename the option for disabling suspension from options.suspend to options.suspension.
Fixes #25073.
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