bug#44528: New bidi problems with outline-mode (Arabic, Hebrew, ..)

[Eli Zaretskii <eliz@gnu.org>]

> From: Fr Ml <fr_ml@t-online.de>
> Date: Mon, 9 Nov 2020 07:10:38 +0100
> 
> Some time ago (maybe 3 months) I've noticed some problems with the bidi support (right-to-left languages)
> in outline-mode and org-mode.
> 
> One problem I can't reproduce: The characters have then a strange form but If I change the text scale
> (larger or smaller) it becomes normal.
> 
> The second problem I can reproduce, you can see it in the two images:
> 
> In this image: I have the option `bidi-paragraph-direction: nil` (the same if I put in the first line: `-*- mode:
> outline -*-`), to get the right direction for  Hebrew and Arabic. As you see the headline color isn't consistently
> brown. The English text don't have this problem.
> 
> [![The color of the headline changes, gets black. The direction is right to left][1]][1]

This is a known bug#43363, which was already fixed for the upcoming
Emacs 27.2.

> Actually, the first problem is bigger for me but I can't reproduce it; I think that both problems appeared a the
> same time. So maybe solving the second will solve the first one too(?)

Unlikely.  But you didn't say almost anything about this problem:
which characters take a "strange form", what is that strange form,
etc.  It's possible that an obscure bug related to Arabic shaping,
which was fixed just today (see bug#44521), is what you see.  (Do you
use Ivy or some similar add-on?)