frameless window can not resize

[xland]

Frameless window can not resize
OS:Windows 10

  const mainWindow = gui.Window.create({frame:false}); //frame less
  mainWindow.onClose = () => gui.MessageLoop.quit();
  mainWindow.setContentSize({width: 400, height: 250});
  mainWindow.setContentView(createBrowser());
  mainWindow.center();
  mainWindow.activate();
  mainWindow.setResizable(true);  // can not resize