Thanks for fixing it! It was elusive and a bit annoying!
пн, 7 авг. 2017 г. в 20:51, Eli Zaretskii <eliz@gnu.org>:

> > Date: Mon, 07 Aug 2017 15:16:08 +0900
> > From: YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>
> > Cc: 27761@debbugs.gnu.org,
> >       jwiegley@gmail.com,
> >       charles@aurox.ch,
> >       denis.redozubov@gmail.com
> >
> > 1. % emacs -Q
> > 2. (setq bidi-redisplay-reordering nil) C-j
> > 3. (prettify-symbols-mode) C-j
> > 4. (linum-mode) C-j
> > 5. Type "lambda" (without quotations).
> >
> > I hope this is also reproducible on your environment.
>
> Thanks, it is.  The bug should now be fixed on master.
>
> For the benefit of those who are still using Emacs 25, the patch is
> below (it will probably apply with some offset and/or fuzz to the
> Emacs 25 codebase).
>
> diff --git a/src/xdisp.c b/src/xdisp.c
> index 422912e..ad9b298 100644
> --- a/src/xdisp.c
> +++ b/src/xdisp.c
> @@ -5248,6 +5248,7 @@ handle_single_display_spec (struct it *it,
> Lisp_Object spec, Lisp_Object object,
>           it->prev_stop = 0;
>           it->base_level_stop = 0;
>           it->string_from_display_prop_p = true;
> +         it->cmp_it.id = -1;
>           /* Say that we haven't consumed the characters with
>              `display' property yet.  The call to pop_it in
>              set_iterator_to_next will clean this up.  */
> @@ -5966,6 +5967,7 @@ get_overlay_strings_1 (struct it *it, ptrdiff_t
> charpos, bool compute_stop_p)
>        it->multibyte_p = STRING_MULTIBYTE (it->string);
>        it->method = GET_FROM_STRING;
>        it->from_disp_prop_p = 0;
> +      it->cmp_it.id = -1;
>
>        /* Force paragraph direction to be that of the parent
>          buffer.  */
> @@ -20506,6 +20508,7 @@ push_prefix_prop (struct it *it, Lisp_Object prop)
>        it->stop_charpos = 0;
>        it->prev_stop = 0;
>        it->base_level_stop = 0;
> +      it->cmp_it.id = -1;
>
>        /* Force paragraph direction to be that of the parent
>          buffer/string.  */
>