Ensure the media library spinner hides when displaying a cached result set. props kovshenin. see #24859.

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On attachment pages for audio and video, display players. Currently, only a link is displayed. Add minimal CSS rules for compatibility with 2011, 2012, and 2013 themes.

In `prepend_attachment`, add logic to support attachment types that are not `image`.

In `get_post_class()`, don't add the `has-post-thumbnail` class for attachment pages.

Fixes #27243.


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Twenty Fourteen: remove `post_class` filter for `has-post-thumbnail` now that it's added in core for every theme. See #18804.
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Twenty Fourteen: revert r27623 `post_class` filter removal since it will visually break pre-WP 3.9 installs. See #18804.
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Only enqueue the image editor in the media modal in the admin.

props gcorne.
see #21811.

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Remove "Show" prefix from filter dropdowns, see #26743.
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Twenty Fourteen: load Masonry after window load event to give more time for widget content to load before drawing the layout. Closes #27051.
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Further unify and refine media and view control styling. see #27320.

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Add the version string to wp-content.css to avoid tenacious caching woes. see #27320.

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Avoid an undefined function due to `/wp-admin/includes/dashboard.php` being included too late. props obenland. fixes #27457.

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Move `wp.media.view.MediaDetails` to `media-audiovideo.js`. This should have moved over with the rest.

See [27608].


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wpView: select/deselect views when moving the caret with the arrow keys, don't move the caret after deselect(), props gcorne, see #26959
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WP_Query: allow split_the_query = false to avoid a split.

see #26937.

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Return a bool from wp_using_ext_object_cache(), never a null.

see #26937.

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Fix various issues with WP_Adjacent_Post:
 * Performance / number of queries.
 * Incorrect results caused by sticky posts.
 * Back compat for filters, which had used "WHERE" while WP_Query does not; and fixing table references.

props ethitter.
fixes #26937.

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Theme installer:
 * Restore the feature filter.
 * Improve responsiveness.
 * Router updates, fixes.
 * Make "Upload Theme" button more consistent with the admin.
 * Avoid theme-count causing filters to jump.

props matveb.
see #27055.

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Twenty Fourteen: add Audio, Video, and Gallery Styles to editor styles. Props celloexpressions, see #27462.
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Twenty Thirteen: add Audio, Video, and Gallery Styles to editor styles. Props celloexpressions, see #27462.
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3.9-beta2

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