Add post_parent to the private query vars list. Fixes detached media queries.

props SergeyBiryukov.
fixes #27532.

Built from https://develop.svn.wordpress.org/trunk@27782


git-svn-id: http://core.svn.wordpress.org/trunk@27618 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove unused JS variables after [27770]. see #27013.

Built from https://develop.svn.wordpress.org/trunk@27783


git-svn-id: http://core.svn.wordpress.org/trunk@27619 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Color scheme support for the new theme installer UI.

props ryelle.
fixes #27522.

Built from https://develop.svn.wordpress.org/trunk@27784


git-svn-id: http://core.svn.wordpress.org/trunk@27620 1a063a9b-81f0-0310-95a4-ce76da25c4cd
There is no more `video-playlist` shortcode. To use video, it is now `[playlist type="video" ....]`. Also deleting core playlist styles. The `style` attribute is still supported, defaulting to `light`. Our core style support was 4-5 CSS rules. 

See #27552. Leaving open for comments and potential bugs.


Built from https://develop.svn.wordpress.org/trunk@27785


git-svn-id: http://core.svn.wordpress.org/trunk@27621 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove the TinyMCE image toolbar when the image is deleted via the keyboard.

props gcorne.
fixes #27527.

Built from https://develop.svn.wordpress.org/trunk@27786


git-svn-id: http://core.svn.wordpress.org/trunk@27622 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid JS errors when edit image is not available, such as outside of post editing.

props gcorne.
fixes #27551.

Built from https://develop.svn.wordpress.org/trunk@27787


git-svn-id: http://core.svn.wordpress.org/trunk@27623 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Move counting of attachments for audio/video to the backend, instead of using a `reduce` function in JS.

See #27554.


Built from https://develop.svn.wordpress.org/trunk@27788


git-svn-id: http://core.svn.wordpress.org/trunk@27624 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Make sure Playlist states that are `audio` are marked as such with proper localized strings.

See #27554.

Built from https://develop.svn.wordpress.org/trunk@27789


git-svn-id: http://core.svn.wordpress.org/trunk@27625 1a063a9b-81f0-0310-95a4-ce76da25c4cd