bug#66141: 29.1; Window size properties not set immediately for window in new frame

[Mattias Nyrell <mattias@nyrell.se>]

On 2023-09-21 20:51, Eli Zaretskii wrote:
> [Please use Reply All to reply, to keep the bug tracer CC'ed.]
>
>> Date: Thu, 21 Sep 2023 20:48:19 +0200
>> From: Mattias Nyrell <mattias@nyrell.se>
>>
>>
>>
>> On 2023-09-21 18:39, Eli Zaretskii wrote:
>>>> Date: Thu, 21 Sep 2023 18:16:01 +0200
>>>> From: Mattias Nyrell <mattias@nyrell.se>
>>>>
>>>> Starting from emacs -Q, enter the following in *scratch*:
>>>>
>>>> (let ((f (make-frame '((fullscreen . maximized)))))
>>>>      (select-frame-set-input-focus f)
>>>>      (message "window-body-width=%s" (window-body-width))
>>>>      (sleep-for 1)
>>>>      (message "window-body-width=%s" (window-body-width)) )
>>>>
>>>> Execute with C-x C-e
>>>>
>>>> Result:
>>>> - A new frame is created.
>>>> - The message "window-body-width=80" is printed
>>>> - The message "window-body-width=190" is printed (exact value depending
>>>> on screen size of course)
>>>>
>>>> Expected result:
>>>> The first printed message should be the same as the second printed message.
>>> Isn't it because the actual resizing of the frame is done by the
>>> window-system, and we can only ask it to do so?
>>>
>>> IOW, I think your expectation is incorrect, as it assumes that frame
>>> move/resize operations are executed immediately.
>> I have no idea, but your explanation sounds very reasonable and it is
>> probably right!
>>
>> Is there a way to get notified when the resize operation has finished?
>> Or is sleeping for a short while a reasonable solution?
> Yes, calling sleep-for is one way.  I would also suggest to try
>
>    (sit-for 0)
>
> If that works, it is faster.
Ok, thank you!

/Mattias