Pass the post object rather than the post ID between the post permalink functions. Fixes #28425. Props arnee
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Prompt the user before leaving the Customizer if they have unsaved changes. props westonruter. fixes #25439.

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When accessing the Customizer from the admin menu, make sure the user is returned to the originating page upon close. We should still investigate the general usage of `customize-loader.js` moving forward, but this approach fixes the immediate issue. props westonruter. fixes #25457.

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Allow an `array()` to be passed as the value for `orderby` to `WP_Query`. Allows for an independent `order` value for each key.

Example: `'orderby' => array( 'title' => 'DESC', 'menu_order' => 'ASC' )`.

Adds docs and unit tests.

Props wonderboymusic, johnbillion, DrewAPicture, dd32, andy.
See #17065.

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Use wp_hash() instead of AUTH_KEY in WP_Customize_Widgets::get_instance_hash_key().

props juliobox.
fixes #28783.
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When setting the poster image for a video shortcode, set that image as the featured image for that attachment (if found) in the background. This AJAX functionality could be used for audio as well.

Introduces `attachment_url_to_postid()` to attempt to turn URLs into post IDs.

Fixes #27891.

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Implement email and url input types where appropriate. Props Kau-Boy. Fixes #22183.
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More consistent icons in place of some buttons for the Customizer and theme install preview.

* Use a single close icon instead of a context-changing cancel/close button in the Customizer. In user testing, this small distinction in language was overlooked, and we use an AYS now instead. This also makes it consistent with the back arrow in Customizer panels.
* Use the same close icon as well as the previous/next arrows from the theme details browser in the theme install preview.

props celloexpressions. fixes #28655.

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Remove autocomplete from the database password screen on setup-config.php. Props hebbet. Fixes #28585.
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Add a `create_wp_error` action which is called when a `WP_Error` instance is created. Fixes #28319. Props ebinnion
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Customizer info section:

* Only show the theme info when doing a live preview of another theme.
* Replace with helper text about what you are customizing and what the Customizer is for.
* Fix focus styling.

props celloexpressions, westonruter. fixes #28550.

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Customizer panels:

* Close all accordion sections when going in and out of panels.
* Fix panel positioning when top-level Customizer controls are scrolled down.
* Keyboard accessibility: only focus on visible elements and transfer between them as needed when navigating around panels.

props celloexpressions. see #27406.

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accordion.js:

* Remove remnants from when some corners were rounded.
* Docs.

props celloexpressions. see #27406.

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Add `@see` reference for `set_post_thumbnail()` in the phpDoc for `wp_ajax_set_attachment_thumbnail()`.

See #27891.

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TinyMCE wpView: remove leftover/unused bits, see #28567.
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