Fix size of Mailvelope iframe for PGP-inlined mail

CHANGELOG

@@ -69,6 +69,7 @@ RELEASE 1.4.4
 - Security: Fix remote code execution via crafted 'im_convert_path' or 'im_identify_path' settings [CVE-2020-12641]
 - Security: Fix local file inclusion (and code execution) via crafted 'plugins' option [CVE-2020-12640]
 - Security: Fix CSRF bypass that could be used to log out an authenticated user [CVE-2020-12626] (#7302)
+- Mailvelope: Fix size of iframe for PGP-inlined mail (#7348)
 
 RELEASE 1.4.3
 -------------

program/js/app.js

@@ -4021,7 +4021,8 @@ function rcube_webmail()
       }
 
       ref.hide_message(msgid);
-      $(selector).addClass('mailvelope').children().not('iframe').hide();
+      $(selector).children().not('iframe').hide();
+      $('#messagebody').addClass('mailvelope');
 
       // on success we can remove encrypted part from the attachments list
       if (ref.env.pgp_mime_part)