bug#56457: 29.0.50; set-frame-width and frame-width are not exactly complimentary

[Pankaj Jangid]

I have written a small lisp function to toggle width of frame to twice
and half. This is not behaving as desired. Here is my lisp.

--8<---------------cut here---------------start------------->8---
(defun my/toggle-frame-width ()
  "Toggle \"frame-width\"."
  (interactive)
  
  (let ((width (frame-width)))
        (if (and (> width 75) (< width 85))
                (set-frame-width nil (* width 2))
          (set-frame-width nil (/ width 2))
        (message "Frame size: %sx%s" (frame-width) (frame-height)))))
(global-set-key (kbd "<f9>") 'my/toggle-frame-width)
--8<---------------cut here---------------end--------------->8---

Steps:
1. emacs -Q
2. Evaluate above lisp. (WARN) This binds <f9> also.
3. Pres <f9> a couple of times 

Result:
After a couple of iterations. The frame-width is getting smaller and
smaller.

Desired behaviour:
It should only toggle the width to double and half alternately.



In GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.24, cairo 
version 1.16.0)
 of 2022-07-09 built on anant
Repository revision: 29c8866c7fcd325995c6fc9b2b18537855fee52c
Repository branch: master
System Description: Debian GNU/Linux 11 (bullseye)

Configured using:
 'configure --prefix=/home/pankaj/.local --with-pgtk'

Configured features:
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