bug#57728: 29.0.50; Emacs writes wrong glyph at the bottom-right corner of text terminals

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

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Gregory Heytings <gregory@heytings.org> writes:

>>
>> Thanks, but please provide more info:
>>
>> . the exact recipe to try (I tried to follow the above, but
>> couldn't, I guess I misunderstand what you mean)
>>
>> . on which terminal emulators this is known to happen, at least in
>> your case (and if you happen to know, also others)
>>
>
> Here is (I think) a recipe to demonstrate what the OP has in mind
> (tested with xterm, rxvt, st, kitty, alacritty, Linux console):
>
> 1. emacs -Q -nw
>
> 2a. if your terminal emulator has a light background: M-x load-theme
> RET modus-vivendi RET
>
> 2b. if your terminal emulator has a dark background: M-x load-theme
> RET modus-operandi RET
>
> Observe at that point that the last character (the one at the bottom
> right) does not have the background color of the chosen theme.  So far
> so good.
>
> 3. M-: (define-key minibuffer-mode-map (kbd "C-t") (defun bug57728 () (interactive) (dotimes (i 5000) (insert (+ (% (random) 26) ?a))))) RET

But defun's docstring says "The return value is undefined".

>
> 4. M-: C-t
>
> 5. Now hit C-p a few times, until you see the "\" continuation
> character appear on the last character (the one at the bottom right).
> This should not happen.
>
> 6. Now press C-g.  The continuation character stays there.  Again this
> should not happen.
>
> (Note that the "\" continuation character disappears with C-l, after
> step 5 and after step 6.)
>
>
>

Yeah, you understood a part of my message, and Lars Ingebrigtsen
understood the other part.

-- 
Akib Azmain Turja

Find me on Mastodon at @akib@hostux.social.

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