When switching to the Text editor, make the textarea visible to screen readers.

props afercia.
fixes #29815.
Built from https://develop.svn.wordpress.org/trunk@29815


git-svn-id: http://core.svn.wordpress.org/trunk@29581 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `wp_delete_attachment()`: account for orphan sizes by looping over the sizes stored in metadata, instead of relying on the current sizes stored in `$_wp_additional_image_sizes`.

Props JoshuaAbenazer, desrosj, markoheijnen.
Fixes #24518.

Built from https://develop.svn.wordpress.org/trunk@29816


git-svn-id: http://core.svn.wordpress.org/trunk@29582 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Network Admin Menu: 

* Don't display update count for Themes when the user doesn't have the 'update_themes' cap
* Don't display update count for Plugins when there aren't any/count is `0`

Props peterchester.
Fixes #29651.

Built from https://develop.svn.wordpress.org/trunk@29817


git-svn-id: http://core.svn.wordpress.org/trunk@29583 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `activate_plugin()`, do not re-run the activation routine for already-active network-wide plugins.

Adds unit test.

Props jbrinley.
Fixes #28651.

Built from https://develop.svn.wordpress.org/trunk@29818


git-svn-id: http://core.svn.wordpress.org/trunk@29584 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Always sanitize user_nicename in wp_insert_user().

Previously, a 'user_nicename' parameter passed into the function was
unsanitized. This could result in a mismatch between the sanitized nicename
generated automatically at user creation, resulting in broken author archive
permalinks.

Props joemcgill.

Fixes #29696.
Built from https://develop.svn.wordpress.org/trunk@29819


git-svn-id: http://core.svn.wordpress.org/trunk@29585 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use a more consistent markup on taxonomy and user screens.

props paulwilde.
fixes #29842.
Built from https://develop.svn.wordpress.org/trunk@29820


git-svn-id: http://core.svn.wordpress.org/trunk@29586 1a063a9b-81f0-0310-95a4-ce76da25c4cd
* Use correct context for 'Name' and 'Parent' strings on taxonomy screens.
* Remove unnecessary context for 'Slug' and 'Description' strings.

props andg.
fixes #29824.
Built from https://develop.svn.wordpress.org/trunk@29821


git-svn-id: http://core.svn.wordpress.org/trunk@29587 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add an aria-label attribute with commenter's name to get_comment_reply_link().

props joedolson, merty, andrewryno.
fixes #16433.
Built from https://develop.svn.wordpress.org/trunk@29822


git-svn-id: http://core.svn.wordpress.org/trunk@29588 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Make link construction in get_comment_reply_link() and get_post_reply_link() more readable.

see #16433.
Built from https://develop.svn.wordpress.org/trunk@29823


git-svn-id: http://core.svn.wordpress.org/trunk@29589 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid a PHP notice in list_plugin_updates() if plugins_api() returned a WP_Error object.

fixes #29583.
Built from https://develop.svn.wordpress.org/trunk@29825


git-svn-id: http://core.svn.wordpress.org/trunk@29590 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use correct links for filtering plugin reviews.

props OriginalEXE.
fixes #29754.
Built from https://develop.svn.wordpress.org/trunk@29826


git-svn-id: http://core.svn.wordpress.org/trunk@29591 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: Move custom description for background color and image from sections to controls in the customizer.

props jb510.
fixes #29490.
Built from https://develop.svn.wordpress.org/trunk@29827


git-svn-id: http://core.svn.wordpress.org/trunk@29592 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Switch line-height added in [29790] to a unitless value.

props janhenckens.
fixes #29451.
Built from https://develop.svn.wordpress.org/trunk@29828


git-svn-id: http://core.svn.wordpress.org/trunk@29593 1a063a9b-81f0-0310-95a4-ce76da25c4cd