message: Add a tray popup message when the tray first becomes visible.
  This ensures that the user is notified when a file operation is currently running via the tray.
diff: @@ -86,6 +86,8 @@ void TrayUI::checkJobs(){
  emit JobsFinished();
  this->hide();
  }else{
  + bool showNotify = !this->isVisible();
  this->show();
  + if(showNotify){ this->showMessage(tr("New Tasks Running"),"",QSystemTrayIcon::NoIcon, 2000); }
  }
  }
  