bug#70213: Info-mode side window fit-window-to-buffer issue

[Joseph Turner via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Stephen Berman <stephen.berman@gmx.net> writes:

> On Sun, 07 Apr 2024 13:07:06 -0700 Joseph Turner <joseph@breatheoutbreathe.in> wrote:
>
>> Stephen Berman <stephen.berman@gmx.net> writes:
>>
>>> On Sun, 07 Apr 2024 10:47:58 -0700 Joseph Turner
>>> <joseph@breatheoutbreathe.in> wrote:
>>>
>>>> Stephen Berman <stephen.berman@gmx.net> writes:
>>>>
>>>>> On Sat, 06 Apr 2024 18:59:45 -0700 Joseph Turner
>>>>> <joseph@breatheoutbreathe.in> wrote:
>>>>>
>>>>>> On my machine, the following snippet:
>>>>>>
>>>>>> (progn
>>>>>>   (setq fit-window-to-buffer-horizontally t)
>>>>>>
>>>>>>   (setq display-buffer-alist
>>>>>>         '(((derived-mode . Info-mode)
>>>>>>            display-buffer-in-side-window
>>>>>>            (side . right)
>>>>>>            (window-width . fit-window-to-buffer))))
>>>>>>
>>>>>>   (info)
>>>>>>   (window-width))
>>>>>>
>>>>>> without the patch evaluates to 6
>>>>>>
>>>>>> with the patch evaluates to 71
>>>>>>
>>>>>> What happens on your machine?
>>>>>
>>>>> without the patch: 6
>>>>> with the patch: 70
>>>>
>>>> This indicates that the patch fixes the bug on your machine also.  Right?
>>>>
>>>>> For an unsplit window, (window-width) returns 80 (with emacs -Q); does
>>>>> it also for you?  I'm building on GNU/Linux with Gtk3.
>>>>
>>>> Sorry, an unsplit window where?  Please clarify the instructions :)
>>>>
>>>> Thanks!
>>>
>>> Sorry for being unclear; what I meant is the return value of
>>> (window-width) evaluated immediately after starting emacs -Q, so the
>>> frame consists of a single window.
>>
>> 138 on my machine.
>
> I've never heard of that for -Q.  I though 80, which is what I get, was
> standard, at least under X, and that's what the Emacs user manual says
> (info "(emacs) Window Size X"): "The default frame width is 80
> characters and the default height is between 35 and 40 lines, depending
> on the OS and the window manager."  What graphical display system are
> you using?

I am using EXWM, and I ran emacs -Q as a subprocess inside of the main
Emacs process.  The emacs -Q instance ended up being full screen.

Joseph