bug#36894: Restore frameset focus and selectedness

[Juri Linkov]

> If the window manager doesn't comply or is set up "wrongly", yes.
> Focus stealing cannot be handled by the application alone.  But if the
> window manager is compliant, setting the 'no-focus-on-map' frame
> parameter should handle the problem.

I see that the MATE window manager doesn't select the new frame after

  (make-frame '((no-focus-on-map . t)))

Then I don't understand the logic of make-frame-command:

  (defun make-frame-command ()
    (interactive)
    (if (display-graphic-p)
        (make-frame)
      (select-frame (make-frame))))

On a graphic display it doesn't select the new frame explicitly,
maybe on the assumption that all window managers should select it
afterwards?