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

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

On Sun, 07 Apr 2024 15:13:07 -0700 Joseph Turner <joseph@breatheoutbreathe.in> wrote:

> 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.

Ah, ok, so that overrides the Emacs default frame parameters for X.  So
I guess that's why you get different results with
fit-window-to-buffer-horizontally set to t than I do.

Steve Berman