Logging in: when the Remember Me checkbox is checked, make sure the browser continues to send the expired cookies so the "login grace period" for POST and AJAX requests works. Fixes #24735.
Built from https://develop.svn.wordpress.org/trunk@25107


git-svn-id: http://core.svn.wordpress.org/trunk@25089 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use `reset()` to grab the first taxonomy in an array, not by numerical index. Cleans up whitespace. Props webord, nbachiyski. Fixes #23506. 

Built from https://develop.svn.wordpress.org/trunk@25108


git-svn-id: http://core.svn.wordpress.org/trunk@25090 1a063a9b-81f0-0310-95a4-ce76da25c4cd
User state settings:
- Allow empty cookie value to be saved.
- Use get_current_user_id() instead of wp_get_current_user().
- Use is_user_member_of_blog().
- Sanitize both name and value in wp_set_all_user_settings().
- Some var names and code formatting cleanup.
Fixes #24921.
Built from https://develop.svn.wordpress.org/trunk@25109


git-svn-id: http://core.svn.wordpress.org/trunk@25091 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Correct phpdoc for WP_Query::$post. props lgedeon, fixes #25130.

Built from https://develop.svn.wordpress.org/trunk@25110


git-svn-id: http://core.svn.wordpress.org/trunk@25092 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Have wp-signup.php match the proper default for the 'registration' network option.

props wpmuguru.
fixes #18186.

Built from https://develop.svn.wordpress.org/trunk@25112


git-svn-id: http://core.svn.wordpress.org/trunk@25093 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Deprecate $network_id argument in get_blog_count(). props jeremyfelt. fixes #25129.
Built from https://develop.svn.wordpress.org/trunk@25113


git-svn-id: http://core.svn.wordpress.org/trunk@25094 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid a fatal error in WP_Http::request() if $response is a WP_Error instance. props dllh, nacin. fixes #24987.
Built from https://develop.svn.wordpress.org/trunk@25114


git-svn-id: http://core.svn.wordpress.org/trunk@25095 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove 'admin' as a fallback for username in install. props tivnet, DrewAPicture. fixes #24078.
Built from https://develop.svn.wordpress.org/trunk@25115


git-svn-id: http://core.svn.wordpress.org/trunk@25096 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid displaying multiple instances of the same feature pointers on a single screen. props nacin. fixes #25022 for trunk.
Built from https://develop.svn.wordpress.org/trunk@25117


git-svn-id: http://core.svn.wordpress.org/trunk@25097 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Make in_category() an alias of has_category(). fixes #16718.
Built from https://develop.svn.wordpress.org/trunk@25119


git-svn-id: http://core.svn.wordpress.org/trunk@25099 1a063a9b-81f0-0310-95a4-ce76da25c4cd