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

> Gerd Möllmann <gerd.moellmann@gmail.com> writes:
>
>> Akib Azmain Turja <akib@disroot.org> writes:
>>
>>> Gerd Möllmann <gerd.moellmann@gmail.com> writes:
>>>
>>> I mean, what files to change in order to do this?  I think it's
>>> tty_write_glyphs and tty_write_glyphs_with_face in term.c.
>>
>> Are you interested in implementing something?  You could re-open this
>> bug then, no problem.  Or are you maybe just evaluating if you'd like to
>> do it?  Please give a hint.
>
> 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.
>

I have implemented it.  Implementing it was easier than I thought.  Here
is the patch: