Added support for url open event on Mac

src/qmacapplication.cpp

@@ -43,6 +43,10 @@ bool QMacApplication::event(QEvent * ev) {
   case QEvent::FileOpen:
     {
       QString path = static_cast<QFileOpenEvent *>(ev)->file();
+      if(path.isEmpty()) {
+        // Get the url instead
+        path = static_cast<QFileOpenEvent *>(ev)->url();
+      }
       qDebug("Received a mac file open event: %s", qPrintable(path));
       emit newFileOpenMacEvent(path);
       return true;