An XSS vulnerability discovered in the Flash fallback in the MediaElement
The fallback has been removed.
Fixes
JavaScript errors preventing Firefox browser saving a post.
The previous taxonomy-agnostic behavior of get_category_link() and category_description() was restored.
Switching themes will now attempt to restore previous widget assignments, even when there are no sidebars to map.
Use MySQLi when available by default.
Update random_compat external library for PHP 7 linting failure.