GNU bug report logs - #41626
28.0.50; activating mark breaks RTL shaping in etc/HELLO (auto-composition-mode)

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From: Pip Cet <pipcet <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: contovob <at> tcd.ie, 41626 <at> debbugs.gnu.org
Subject: bug#41626: 28.0.50; activating mark breaks RTL shaping in etc/HELLO (auto-composition-mode)
Date: Sun, 31 May 2020 17:08:56 +0000

[Message part 1 (text/plain, inline)]

On Sun, May 31, 2020 at 2:59 PM Eli Zaretskii <eliz <at> gnu.org> wrote:
> > From: Pip Cet <pipcet <at> gmail.com>
> > Date: Sun, 31 May 2020 13:10:47 +0000
> > Cc: 41626 <at> debbugs.gnu.org
> >
> > What I don't understand is why it works in pure RTL paragraphs,
> > though. If I yank the Arabic greeting into a new buffer, I can place
> > the mark anywhere and nothing happens to the shaping.
>
> Because testing where the face changes while going backwards in a
> buffer is "tricky".  See handle_stop_backwards and its callers.

Thanks!

I don't see why we need to invalidate composition state in
handle_stop_backwards.

How's this?

[0001-Avoid-losing-composition-state-in-handle_stop_backwa.patch (text/x-patch, attachment)]

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