Re: "Final" version of tty child frames

[Eli Zaretskii]

> Date: Fri, 17 Jan 2025 10:09:21 +0100
> Cc: jared@finder.org, emacs-devel@gnu.org
> From: martin rudalics <rudalics@gmx.at>
> 
>  > So if we bump into a glyph from the child frame in the middle of
>  > examining glyphs from a string, we could fail to notice that until
>  > later.
> 
> I would have to understand how that happens.  How, in practice, are we
> "in the middle of examining glyphs from a string"?

Imagine a line that has a 'display' property whose value is a string
in the middle of the line.  Then that line on display will look like
this:

   BBBBBBBBBBBBBSSSSSSSSSBBBBBBBBB

where the B's are glyphs produced from buffer text, and S's are glyphs
produced from the display string.  Now arrange for a child frame to be
displayed such that its left border crosses the above line somewhere
in the middle of the S's.  That's the situation I was talking about.