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. Fixes some issues in the admin area where some older browsers (IE7, in particular) may slow down, lag, or freeze.
. Fixes an issue where a theme may not preview correctly, or its screenshot may not be displayed.
. Fixes the use of multiple trackback URLs in a post.
. Prevents improperly sized images from being uploaded as headers from the customizer.
. Ensures proper error messages can be shown to PHP4 installs. (WordPress requires PHP 5.2.4 or later.)
. Fixes handling of oEmbed providers that only return XML responses.
. Addresses pagination problems with some category permalink structures.
. Adds more fields to be returned from the XML-RPC wp.getPost method.
. Avoids errors when updating automatically from very old versions of WordPress (pre-3.0).
. Fixes problems with the visual editor when working with captions.
Fix unfiltered HTML capabilities in multisite.
. Fix possible privilege escalation in the Atom Publishing Protocol endpoint.
. Allow operations on network plugins only through the network admin.
. Hardening: Simplify error messages when uploads fail.
. Hardening: Validate a parameter passed to wp_get_object_terms().