bug#65217: 29.1; set-frame-size gets confused and drops calls

[martin rudalics]

> I'm not sure yet, but after thinking a bit more about this, ATM my
> conclusion is that adding a sentence in the docstings of set-frame-*
> and modify-frame-parameters, suggesting to use (redisplay t) after
> these functions, would be enough.

Not really, I think.  With emacs -Q try

(let ((i 100))
  (while (> i 0)
    (scroll-bar-mode -1)
    (scroll-bar-mode 1)
    (sit-for 0.1)
    (setq i (1- i))))

martin