Re: "Final" version of tty child frames

[Eli Zaretskii]

> Date: Thu, 16 Jan 2025 19:00:24 +0100
> Cc: jared@finder.org, emacs-devel@gnu.org
> From: martin rudalics <rudalics@gmx.at>
> 
> I attach what I have done so far.  It only handles LR text so far and
> affects only the special case where W is the selected window and there
> is a child frame on its frame.
> 
> I also attach a file tty-child-frames.el to be loaded with emacs -Q -nw.
> With C-l and M-l make one or two child frames.  In the normal frame do
> M-x info and scroll it if necessary so you an see a line which extends
> past one of these frames.  On such a line lean on C-f and C-b - the
> cursor should remain invisible as long as point is hidden by a child
> frame and should reappear as soon as it is no more hidden.

Did you try this with auto-hscroll-mode, both set to t and to
current-line?  What happens then if you move cursor with C-n and enter
a line which is partially obscured by a child frame?  Or if point
becomes hidden because it enters the obscure part of the frame from
above or below, not from left or from right?

> +  if (is_tty_selected && glyph->charpos > PT)
> +    {
> +      w->cursor.hpos = -1;
> +      w->cursor.x = -1;
> +    }

Why do you need this test, and specifically the second part of the
condition?