title: There is a strange phenomenon in NSWindow's Autosave
body: <p>After I set the saved name, the save is valid, but it does not mean my last actual size.</p>
  
  <p>After my observation, I found that the height of the open NSWindow is smaller than that of the last one. It's about title's height.</p>
  
  <p>This may have something to do with my setup, but I don't know how to improve it. So that the size and location of the storage is exactly the same as the last time.</p>
  
  <pre><code>    override func windowDidLoad() {
      super.windowDidLoad();
      self.windowFrameAutosaveName = NSWindow.FrameAutosaveName(rawValue: "MainAppWindowAutosave");
      self.window?.titleVisibility = .hidden
      self.window?.isMovableByWindowBackground = true;
      self.window?.titlebarAppearsTransparent = true
      self.window?.styleMask = [.fullSizeContentView,.titled,.resizable,.miniaturizable,.closable]
      self.window?.toolbar?.isVisible = false;
  }
  </code></pre>