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Re: Improper UTF-8 combining character handling


From: Andreas Schwab
Subject: Re: Improper UTF-8 combining character handling
Date: Tue, 12 Jun 2007 21:40:52 +0200
User-agent: Gnus/5.110006 (No Gnus v0.6) Emacs/22.0.97 (gnu/linux)

Sean Burke <address@hidden> writes:

> I've retried with 3.2-17 with the same results. Notably, the issue isn't
> (and has not been) that all multibyte characters are handled properly.
> Instead, sequences which contain combining characters seem to treat the
> sequence inconsistently. For example, the character that represents D
> WITH DOT ABOVE, U+1E0A, is handled properly. However, the equivalent
> sequence U+0044 + U+0307, consisting of D and COMBINING DOT ABOVE, is
> not handled properly. Backspacing through the sequence removes both
> characters with one backspace, but only the COMBINING DOT ABOVE glyph is
> removed.

That looks like a bug in your terminal emulator.  The sequence U+0044
U+0307 should occupy exactly one screen column by the fact that the
second character combines with the first one, ie. it should render
identical to U+1E0A.  This works correctly with current versions of
xterm or konsole.

Andreas.

-- 
Andreas Schwab, SuSE Labs, address@hidden
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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"And now for something completely different."




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