Re: "Final" version of tty child frames

[Eli Zaretskii]

> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> Cc: tumashu@163.com,  emacs-devel@gnu.org
> Date: Wed, 23 Oct 2024 13:04:17 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > The current branch hits an assertion violation when showing RTL text
> > in a child window.  (Showing RTL text in the parent window works
> > fine.)  Here's the recipe:
> >
> >  emacs -Q -nw
> >  Evaluate in *scratch:
> >
> >     (defun my-make-child ()
> >       (interactive)
> >       (make-frame `((parent-frame . ,(selected-frame))
> >                 (background-color . "gray10")
> >                 (foreground-color . "white")
> >                 (internal-border-width . 1)
> >                 (top . 15)
> >                 (left . 40)
> >                 (width . 80)
> >                 (height . 25))))
> >
> >  M-x my-make-child RET
> >  C-x 5 o
> >  C-x C-f etc/tutorials/TUTORIAL.he RET
> 
> Could you please check with what I pushed now? There were several
> problem, starting with an error I made while porting this, plus thinkos.
> Strangely, I didn't run into the assertion with the recipe, so it's
> probably best if you check yourself if it works now.

The assertion violation is gone, and the display seems correct, but I
now get compilation warning:

    CC       dispnew.o
  In file included from dispnew.c:27:
  dispnew.c: In function ‘combine_updates_for_frame’:
  lisp.h:1096:68: warning: null pointer dereference [-Wnull-dereference]
   1096 |           && ((XUNTAG (a, Lisp_Vectorlike, union 
vectorlike_header)->size
        |                                                                    ^

I have no idea what is GCC talking about.

Thanks.