Fix the drag'n drop of directories on windows. Thanks to rohanpm on #qt for the idea. Close #1525

modules/gui/qt4/main_interface.cpp

@@ -1095,7 +1095,7 @@ void MainInterface::dropEvent(QDropEvent *event)
      bool first = true;
      foreach( QUrl url, mimeData->urls() )
      {
-        QString s = url.toString();
+        QString s = url.toLocalFile();
         if( s.length() > 0 ) {
             playlist_Add( THEPL, qtu(s), NULL,
                           PLAYLIST_APPEND | (first ? PLAYLIST_GO:0),