decode-coding-region broken

[Andreas Schwab]

When decode-coding-region is instructed to decode in-place it can
clobber the buffer text with NULs.  That can best be observed when
running dired-do-redisplay on a (big) subdirectory in a dired buffer.
Sometimes parts of the newly inserted directory text are be overwritten
with NULs.  This happens only rarely, perhaps once in 10-20 tries.
Perhaps garbage collection is biting here?  The new way of decoding
in-place dates back to the very start of the emacs-unicode-2 branch,
unfortunately checked in as part of a big merge without history.

Andreas.

-- 
Andreas Schwab, SuSE Labs, address@hidden
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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