Fix an error caused by [28604] in `get_comments_number()` unit tests.

Props SergeyBiryukov.
Fixes #26240.


Built from https://develop.svn.wordpress.org/trunk@28638


git-svn-id: http://core.svn.wordpress.org/trunk@28456 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Make the image editor less jumpy when opening.

Props eddiemoya, ericlewis.
Fixes #22793.


Built from https://develop.svn.wordpress.org/trunk@28639


git-svn-id: http://core.svn.wordpress.org/trunk@28457 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `WP_Image_Editor_GD::_save()`, pass `$compression_level` into the args array for `->make_image()`.

Props MuViMoTV, markoheijnen, SergeyBiryukov, mikemanger, ericlewis.
Fixes #24380.


Built from https://develop.svn.wordpress.org/trunk@28640


git-svn-id: http://core.svn.wordpress.org/trunk@28458 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Adjacent links in wp_head() should only be generated for posts, not pages.

props alexander.rohmann.
fixes #21658.
Built from https://develop.svn.wordpress.org/trunk@28641


git-svn-id: http://core.svn.wordpress.org/trunk@28459 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add paragraph tags to 'Add Existing User' section on 'Add New User' screen in multisite.

props jkudish, topher1kenobe.
fixes #20271.
Built from https://develop.svn.wordpress.org/trunk@28642


git-svn-id: http://core.svn.wordpress.org/trunk@28460 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Display the site scheme, not the current scheme on Edit Site screen in network admin.

props johnbillion.
fixes #28406.
Built from https://develop.svn.wordpress.org/trunk@28643


git-svn-id: http://core.svn.wordpress.org/trunk@28461 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid stomping of the $plugin variable in activate_plugin().

fixes #28102.
Built from https://develop.svn.wordpress.org/trunk@28644


git-svn-id: http://core.svn.wordpress.org/trunk@28462 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: change hardcoded pagination base to use the WordPress Rewrite object's `pagination_base` value instead. Document global variable usage properly.

Props SergeyBiryukov, fixes #28405.
Built from https://develop.svn.wordpress.org/trunk@28645


git-svn-id: http://core.svn.wordpress.org/trunk@28463 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Plugin activation/deletion errors should be styled as such.

props johnbillion.
fixes #28260.
Built from https://develop.svn.wordpress.org/trunk@28646


git-svn-id: http://core.svn.wordpress.org/trunk@28464 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Capitalize 'ID' correctly to avoid random failures of Tests_Tax_Query::test_term_taxonomy_id_field_no_taxonomy().

see #25284.
Built from https://develop.svn.wordpress.org/trunk@28647


git-svn-id: http://core.svn.wordpress.org/trunk@28465 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix typo in mbstring_binary_safe_encoding() description.

props ghost1227.
fixes #28423.
Built from https://develop.svn.wordpress.org/trunk@28648


git-svn-id: http://core.svn.wordpress.org/trunk@28466 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `WPPlaylistView::ended()`, at the end of a playlist, set the index to `0` and call `->setCurrent()` instead of `->loadCurrent()` so that the first track is properly highlighted.

Fixes #28428.

Built from https://develop.svn.wordpress.org/trunk@28649


git-svn-id: http://core.svn.wordpress.org/trunk@28467 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In the spirit of [27622], add a few CSS rules to ensure that videos will be responsive, regardless of theme.

Props Funkatronic.
Fixes #28414.

Built from https://develop.svn.wordpress.org/trunk@28650


git-svn-id: http://core.svn.wordpress.org/trunk@28468 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add oEmbed support for TED talks.

props pdclark.
fixes #28285.
Built from https://develop.svn.wordpress.org/trunk@28651


git-svn-id: http://core.svn.wordpress.org/trunk@28469 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Because of YouTube's overwhelming dominance in the online video space, we should help our users who paste bad URLs when possible. It is easy to fix `http://youtube.com/embed/acb1233` URLs by turning them into `http://youtube.com/watch?v=abc1233` embeds using an embed handler (we already have one to fix Google Video embeds).

We should avoid doing this in almost every other case, but it's YouTube, and it's an easy error for a novice to make.

Fixes #24660.

Built from https://develop.svn.wordpress.org/trunk@28652


git-svn-id: http://core.svn.wordpress.org/trunk@28470 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Make sure `$post` is properly documented as optional where applicable.

See #28388.

Built from https://develop.svn.wordpress.org/trunk@28653


git-svn-id: http://core.svn.wordpress.org/trunk@28471 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Ensure `$post_id` is documented as optional where applicable.

See #28388.

Built from https://develop.svn.wordpress.org/trunk@28654


git-svn-id: http://core.svn.wordpress.org/trunk@28472 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Be more specific that `$post_id` does not default to the ID of the global `$post` in some cases.

See [28654]. See #28388.

Built from https://develop.svn.wordpress.org/trunk@28655


git-svn-id: http://core.svn.wordpress.org/trunk@28473 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Improve inline documentation for wp-includes/load.php.

Props ericlewis, DrewAPicture.
Fixes #24886.

Built from https://develop.svn.wordpress.org/trunk@28656


git-svn-id: http://core.svn.wordpress.org/trunk@28474 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Mark the `MYSQL_NEW_LINK` constant as deprecated in 3.9+ as no equivalent to the `$new_link` parameter exists in `mysqli_*` functions.

Fixes #27933.

Built from https://develop.svn.wordpress.org/trunk@28657


git-svn-id: http://core.svn.wordpress.org/trunk@28475 1a063a9b-81f0-0310-95a4-ce76da25c4cd