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format_sanitized_subject: Don't trim past initial length of strbuf
If the subject line is '...' the strbuf will be accessed before the first dot is added; potentially changing the strbuf passed into the function or accessing sb->buf[-1] if it was originally empty. Reported-by: René Scharfe <rene.scharfe@lsrfire.ath.cx> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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