How can I programmatically ensure that the window tabbar is always displayed in macOS Swift?

edit

You can use the tabbingMode property of the NSWindow class to ensure that the window tabbar is always displayed in macOS Swift.

Here is an example code snippet that sets the tabbingMode property of a window to preferred:

let window = NSApplication.shared.windows.first! window.tabbingMode = .preferred 

This will make the window tabbar always visible, even if there is only one tab in the window. If you set the tabbingMode property to automatic, the tabbar will only be visible if there are multiple tabs in the window.