some smaller fixes and improvements for joomla testing

src/commands.hxx

@@ -1548,6 +1548,8 @@ class Download: public Command {
     }
     bool execute(Script* script, QWebFrame* frame) {
       Logger log(this, script);
+      _realfilename = script->replacevars(_filename);
+      log("REALFILENAME="+_realfilename);
       frame->page()->setForwardUnsupportedContent(true);
       connect(frame->page(), SIGNAL(unsupportedContent(QNetworkReply*)),
               this, SLOT(unsupportedContent(QNetworkReply*)));
@@ -1577,16 +1579,15 @@ class Download: public Command {
       _filesuccess = filesuccess;
     }
     void unsupportedContent(QNetworkReply* reply) {
-      _realfilename = reply->url().toString().split('/').last();
-      if (_filename.size())
-        _realfilename = _filename;
-      else if (reply->header(QNetworkRequest::ContentDispositionHeader)
-               .isValid()) {
-        QString part(reply->header(QNetworkRequest::ContentDispositionHeader)
-                     .toString());
-        if (part.contains(QRegularExpression("attachment; *filename="))) {
-          part.replace(QRegularExpression(".*attachment; *filename="), "");
-          if (part.size()) _realfilename = part;
+      if (!_realfilename.size()) {
+        _realfilename = reply->url().toString().split('/').last();
+        if (reply->header(QNetworkRequest::ContentDispositionHeader).isValid()) {
+          QString part(reply->header(QNetworkRequest::ContentDispositionHeader)
+                       .toString());
+          if (part.contains(QRegularExpression("attachment; *filename="))) {
+            part.replace(QRegularExpression(".*attachment; *filename="), "");
+            if (part.size()) _realfilename = part;
+          }
         }
       }
       connect(new RunDownload(reply, _realfilename),