Set real content-type for file downloads (#1489439)

CHANGELOG

@@ -1,6 +1,7 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Set real content-type for file downloads (#1489439)
 - Update TinyMCE to version 3.5.10 (#1489442)
 - Fix keyboard navigation in list widgets (#1489392)
 - Allow plugins to grab the reference of opened windows (#1489413)

program/steps/mail/get.inc

@@ -220,13 +220,7 @@ else if (strlen($part_id)) {
     $browser = $RCMAIL->output->browser;
     list($ctype_primary, $ctype_secondary) = explode('/', $mimetype);
 
-    // send download headers
-    if ($plugin['download']) {
-      header("Content-Type: application/octet-stream");
-      if ($browser->ie)
-        header("Content-Type: application/force-download");
-    }
-    else if ($ctype_primary == 'text') {
+    if (!$plugin['download'] && $ctype_primary == 'text') {
       header("Content-Type: text/$ctype_secondary; charset=" . ($part->charset ? $part->charset : RCMAIL_CHARSET));
     }
     else {