GNU bug report logs - #59963
29.0.50; 'window-max-chars-per-line' doesn't always work on GUI without fringe

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From: Akib Azmain Turja <akib <at> disroot.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 59963 <at> debbugs.gnu.org
Subject: bug#59963: 29.0.50; 'window-max-chars-per-line' doesn't always work on GUI without fringe
Date: Sun, 11 Dec 2022 20:50:13 +0600

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Eli Zaretskii <eliz <at> gnu.org> writes:

>> Date: Sun, 11 Dec 2022 17:13:41 +0600
>> From:  Akib Azmain Turja via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
>> 
>> 'window-max-chars-per-line' doesn't always work on GUI when fringe width
>> is set to zero.  Although it returns seemingly correct answer, actually
>> writing that characters results in the continuation/truncation glyph to
>> appear, decreasing the text area width.
>> 
>> I don't know precisely what condition needs to be meet for trigger the
>> bug.  But I think this is triggered when the width of the text area of
>> window in character is a fraction.  For example, my window is 1366px
>> width, each character takes 8px; so my window is 170.75 characters
>> width, and this triggers the bug.
>> 
>> This bug affects Term, Eat, Eat in Eshell, Coterm in Shell mode, Vterm,
>> and possibly any other Emacs terminal emulator.
>> 
>> Reproduction steps:
>> 
>> 1.  Run the command 'emacs -nw -Q' in any of the terminal emulators
>>     listed above.
>> 2.  Remove fringes with 'M-: (set-window-fringes nil 0 0)'.
>> 3.  To make the bug is even more clear, enable 'visual-line-mode'.
>> 4.  If everything seem to be OK, resize the window.
>
> I tried reproducing the problem, but couldn't:
> window-max-chars-per-line returns a value correctly truncated to the
> number of fully visible characters that can be shown on the line,
> minus the continuation/truncation glyph if there should be one.

I forgot to mention, probably you need to set 'window-resize-pixelwise'
to t to get the correct width of reproducing the bug.

-- 
Akib Azmain Turja, GPG key: 70018CE5819F17A3BBA666AFE74F0EFA922AE7F5
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