Just tried an ubuntu 18.04 with zsh 5.4.2 (x86_64-ubuntu-linux-gnu)
and I am able to reproduce.
I tried also with gnome-terminal, same result.
I have tried en_US.utf8 and it_IT.utf8, can you share yours?
thanks


Pier Paolo Grassi


Il giorno mer 18 mag 2022 alle ore 21:55 Bart Schaefer <
schaefer@brasslantern.com> ha scritto:

> On Wed, May 18, 2022 at 12:40 PM Pier Paolo Grassi <pierpaolog@gmail.com>
> wrote:
> >
> > I use zsh 5.8 (x86_64-pc-linux-musl)
>
> Ahh.  I wonder if this is a side-effect of musl's "special" C locale
> (see workers/50235):
>
> >> Starting with version 1.1.11, musl provides a special C locale where
> bytes
> >> 0x80-0xff are treated as abstract single-byte-character units with no
> actual
> >> character identity (they’re mapped into wchar_t values that occupy the
> >> Unicode surrogates range).
>
> > By the way the problem happens only when the cursor is placed before the
> 4-bytes character.
>
> Still not reproducible on Ubuntu 20.
>