bug#57607: Feature request: Use the character cell on bottom-right corner of a terminal

[Gerd Möllmann]

Akib Azmain Turja <akib@disroot.org> writes:

> Yes, I'm interested, because I think it would help me understand how
> Emacs renders text in terminal, which would help me to implement child
> frame in terminal.  But I don't have the time to do it right now.  I
> hope I can start doing this by late October.

Great!  I've re-opened this issue.

>
>>
>> The places you mention sound right.  It's probably all in term.c.  But
>> I'd like to add, that in principle all places writing to the terminal
>> have to be checked at least.
>>
>> And corner cases have to be taken into consideration :-).  Pulling
>> something out of thin air: What happens if we write RGRG to the
>> bottom-right corner, where R is one red char, and G is 1 green char,
>> say.
>
> I think you meant the following in Bash:
>
> printf "%$((COLUMNS - 4))s\e[31mr\e[32mg\e7\e[32mg\e8\e[@\e[31mr\e[m" "" ; 
> sleep 1 ; printf '\n'
>
> And it works on St, Kitty, Coterm, Term, etc.

What I was thinking of is the Emacs side of things, i.e. can we always
do our magic locally in tty_write... etc., or is it sometimes necessary
to reorder writes at the caller.