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Date: Sat, 16 Oct 2010 14:36:45 +0200
Message-ID: <AANLkTi=NENPEeVmxgqQqT=R_Lfb9grY6VtQGYtnmagO9@mail.gmail.com>
Subject: Re: command line not refresh properly with wide chars when cursor
 would have been inside one
From: Mikael Magnusson <mikachu@gmail.com>
To: zsh workers <zsh-workers@zsh.org>
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On 16 October 2010 13:21, Mikael Magnusson <mikachu@gmail.com> wrote:
> zsh -f
> % echo =E3=81=AE=E3=81=AE=E3=81=AE
> % uuuuuu<up>
> % echo =E3=81=AE    [cursor here]
>
> if you type one more (or less, or three or five more) letters, the
> line refreshes properly, but when it would have ended up in the middle
> of a wide char, the line gets cut off. This has bothered me for quite
> some time but I've never been able to figure out the exact
> circumstances before. Verified in latest cvs and 4.3.6 with -f.

Actually the problem is when the previous line ends in a wide char in
the new line, doesn't matter where the cursor is.

Hmm, it seems the problem is somewhere in refreshline (surprise,
right?). First all the characters of "echo =E3=81=AE" are printed one by on=
e,
but then ol is advanced past the end of the old string "uuuuuu" and
somehow after that are =E3=81=AE=E3=81=AE=E3=81=AE which causes

/* skip past all matching characters */
for (; nl->chr && ZR_equal(*ol, *nl); nl++, ol++, ccs++)
    ;

to trigger, which is why the rest of the string isn't output. Why this
happens is a bit of a mystery to me still.

--=20
Mikael Magnusson