Do not use the alternative if/elseif/else syntax in `prepend_attachment()` introduced in [27622], as per kovshenin.

Fixes #27243.


Built from https://develop.svn.wordpress.org/trunk@27682


git-svn-id: http://core.svn.wordpress.org/trunk@27523 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revert [27184] until `WP_Query` is patched to apply `order` to each space-delimited `orderby` value properly.

See #26042.


Built from https://develop.svn.wordpress.org/trunk@27683


git-svn-id: http://core.svn.wordpress.org/trunk@27524 1a063a9b-81f0-0310-95a4-ce76da25c4cd
When using WP_Query's `"fields" => "ids"` (or `"fields" => "id=>parent"`), the returned values should be an array of integers, not array of integers represented by strings.

Adds unit tests. All other unit tests pass.

Props danielbachhuber.
Fixes #27252.


Built from https://develop.svn.wordpress.org/trunk@27686


git-svn-id: http://core.svn.wordpress.org/trunk@27525 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media manager: Avoid a blank modal when an invalid image size class is set on the image.

props gcorne.
fixes #24409.

Built from https://develop.svn.wordpress.org/trunk@27687


git-svn-id: http://core.svn.wordpress.org/trunk@27526 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Customizer header images: Fix randomizing headers.

props mcsf.
see #21785.

Built from https://develop.svn.wordpress.org/trunk@27688


git-svn-id: http://core.svn.wordpress.org/trunk@27527 1a063a9b-81f0-0310-95a4-ce76da25c4cd
When using `meta_query` in a `WP_Query`, passing `NOT EXISTS` or `''` to `compare` should not require `value` to be set. The resulting SQL should then produce the appropriate `OR` clause for existence of non-existence after passing the query to the `$key_only_queries` stack internally.

Adds unit tests. 

Props chrisguitarguy, for the original patch.
Fixes #23268.


Built from https://develop.svn.wordpress.org/trunk@27689


git-svn-id: http://core.svn.wordpress.org/trunk@27528 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `wp_create_post_autosave()`, intersect the `$new_autosave`'s keys with the keys from `_wp_post_revision_fields()` to ensure that all expected fields are present.

Props kovshenin.
Fixes #25416.


Built from https://develop.svn.wordpress.org/trunk@27690


git-svn-id: http://core.svn.wordpress.org/trunk@27529 1a063a9b-81f0-0310-95a4-ce76da25c4cd
RSS widgets: Omit the title attribute when the summary is shown.

Trim the title attribute to ensure whitespace isn't rendered.

props SergeyBiryukov.
fixes #26520. see #26552.

Built from https://develop.svn.wordpress.org/trunk@27691


git-svn-id: http://core.svn.wordpress.org/trunk@27530 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use the current post's post type when determining post adjacency.

props ethitter.
fixes #26937.

Built from https://develop.svn.wordpress.org/trunk@27692


git-svn-id: http://core.svn.wordpress.org/trunk@27531 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Let us pass `jshint:core`.


Built from https://develop.svn.wordpress.org/trunk@27693


git-svn-id: http://core.svn.wordpress.org/trunk@27532 1a063a9b-81f0-0310-95a4-ce76da25c4cd
TinyMCE: bring back removal of the size-* class when the user soft-resizes an image, see #24409
Built from https://develop.svn.wordpress.org/trunk@27694


git-svn-id: http://core.svn.wordpress.org/trunk@27533 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Correct misleading verbiage in 'print' hook docs.

Standardizes 'print' hook docs on the concept that hooks are fired when scripts and styles are printed.

Props ericlewis for the initial patch.
Fixes #26924.

Built from https://develop.svn.wordpress.org/trunk@27695


git-svn-id: http://core.svn.wordpress.org/trunk@27534 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix typo from [27695]. See #26924.

Built from https://develop.svn.wordpress.org/trunk@27696


git-svn-id: http://core.svn.wordpress.org/trunk@27535 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-includes/default-widgets.php.

Props janw.oostendorp and kpdesign.
Fixes #25638.

Built from https://develop.svn.wordpress.org/trunk@27697


git-svn-id: http://core.svn.wordpress.org/trunk@27536 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-includes/meta.php.

Props raamdev and kpdesign.
Fixes #25826.

Built from https://develop.svn.wordpress.org/trunk@27698


git-svn-id: http://core.svn.wordpress.org/trunk@27537 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-includes/revision.php.

Props adamsilverstein, DrewAPicture.
Fixes #26979.

Built from https://develop.svn.wordpress.org/trunk@27699


git-svn-id: http://core.svn.wordpress.org/trunk@27538 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-includes/nav-menu.php.

Props dustyf, kpdesign.
Fixes #27367.

Built from https://develop.svn.wordpress.org/trunk@27700


git-svn-id: http://core.svn.wordpress.org/trunk@27539 1a063a9b-81f0-0310-95a4-ce76da25c4cd