Make sure mimetypes is an array not object in a better way

program/js/app.js

@@ -820,7 +820,7 @@ function rcube_webmail()
         var qstring = '_mbox='+urlencode(this.env.mailbox)+'&_uid='+this.env.uid+'&_part='+props.part;
 
         // open attachment in frame if it's of a supported mimetype
-        if (this.env.uid && props.mimetype && this.env.mimetypes && $.inArray(props.mimetype, $.map(this.env.mimetypes, function(v,k){ return v })) >= 0) {
+        if (this.env.uid && props.mimetype && this.env.mimetypes && $.inArray(props.mimetype, this.env.mimetypes) >= 0) {
           if (props.mimetype == 'text/html')
             qstring += '&_safe=1';
           this.attachment_win = window.open(this.env.comm_path+'&_action=get&'+qstring+'&_frame=1', 'rcubemailattachment');

program/steps/mail/show.inc

@@ -79,7 +79,7 @@ if ($uid = get_input_value('_uid', RCUBE_INPUT_GET)) {
     }
   }
 
-  $OUTPUT->set_env('mimetypes', $mimetypes);
+  $OUTPUT->set_env('mimetypes', array_values($mimetypes));
 
   if ($CONFIG['drafts_mbox'])
     $OUTPUT->set_env('drafts_mailbox', $CONFIG['drafts_mbox']);