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record_unwind_save_match_data in autocmp_chars

From: Eli Zaretskii
Subject: record_unwind_save_match_data in autocmp_chars
Date: Sat, 03 Oct 2009 11:43:53 +0200

composite.c:autocmp_chars calls record_unwind_save_match_data before
it starts looping on an element of composition-function-table.
However, since the loop calls fast_looking_at, which is documented not
to change match data, is the call to record_unwind_save_match_data
really necessary?  If it is still necessary, what other functions
called by autocmp_chars might clobber match data?

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