Avoid a warning in wpdb::db_connect(). before_needle parameter of strstr() was added in PHP 5.3.

props klihelp, pento.
fixes #27277.
Built from https://develop.svn.wordpress.org/trunk@27503


git-svn-id: http://core.svn.wordpress.org/trunk@27346 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid unintentional overriding of .spinner styles for HiDPI displays.

props mauryaratan for initial patch.
fixes #27269.
Built from https://develop.svn.wordpress.org/trunk@27504


git-svn-id: http://core.svn.wordpress.org/trunk@27347 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add missing hyperlink styles to the login screen. Fixes #27245.
Built from https://develop.svn.wordpress.org/trunk@27505


git-svn-id: http://core.svn.wordpress.org/trunk@27348 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Present a normal admin page when bailing out of the Plugin Editor screen. Fixes #27067. Props SergeyBiryukov.
Built from https://develop.svn.wordpress.org/trunk@27506


git-svn-id: http://core.svn.wordpress.org/trunk@27349 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid searching HTML tags when searching plugins and themes. Fixes #27136. Props enej.
Built from https://develop.svn.wordpress.org/trunk@27507


git-svn-id: http://core.svn.wordpress.org/trunk@27350 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Correct the "View Post" button link when changing a post slug. Fixes #16477. Props aubreypwd.
Built from https://develop.svn.wordpress.org/trunk@27508


git-svn-id: http://core.svn.wordpress.org/trunk@27351 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use correct variable in themes JS, fixes themes.php.

props SergeyBiryukov.
fixes #27360.

Built from https://develop.svn.wordpress.org/trunk@27509


git-svn-id: http://core.svn.wordpress.org/trunk@27352 1a063a9b-81f0-0310-95a4-ce76da25c4cd