Avoid an undefined index notice in wp_http_validate_url().

props jesin.
fixes #27684.
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Customizer: Add `height: auto;` for `select[multiple]`.

fixes #27662.
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Fix typo in hook description for `async_upload_{$type}`.
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RTL: Fix taxonomy quick edit list alignment.

props SergeyBiryukov.
fixes #27629.

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Don't pass variables by reference.

props markjaquith.
fixes #27656.

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Theme Installer: Fix displaying of errors.

props SergeyBiryukov.
fixes #27640.

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Theme Installer: Better responsive styles for feature filters.

props matveb.
fixes #27661.

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Revert the changes made to `data.title` in playlist Underscore templates in [27869]. `{{ data.title }}` causes the title to be double-encoded on the front end.

See #27574.


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Theme Installer: Use JSONP for api.wordpress.org requests.

fixes #27639.

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Theme Installer: Don't encode description entities/HTML.

props johnbillion.
fixes #27641.

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Theme Installer: Separate API from an event handler to avoid issues where a false return value stops the event.

see #27055.

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Better checks for contributors when saving posts.

props dd32, kovshenin, plocha.
see #27452.

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Inline documentation for remaining hooks in wp-admin/includes/upgrade.php.

Props jackreichert, vancoder.
Fixes #27646.

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