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f9829f95a4
* XML-RPC: Improve error messages for unprivileged users. * External Libraries: Disable deserialization in Requests_Utility_FilteredIterator * Embeds: Disable embeds on deactivated Multisite sites. * Coding standards: Modify escaping functions to avoid potential false positives. * XML-RPC: Return error message if attachment ID is incorrect. * Upgrade/install: Improve logic check when determining installation status. * Meta: Sanitize meta key before checking protection status. * Themes: Ensure that only privileged users can set a background image when a theme is using the deprecated custom background page. Brings the changes from [49380,49382-49388] to the 4.3 branch. Props xknown, zieladam, peterwilsoncc, whyisjake, desrosj, dd32. git-svn-id: https://develop.svn.wordpress.org/branches/4.3@49403 602fd350-edb4-49c9-b593-d223f7449a82