find_unique_abbrev: move logic out of get_short_sha1()
The get_short_sha1() is only about reading short sha1s; we do call it in a loop to check "is this long enough" for each object, but otherwise it should not need to know about things like our default_abbrev setting. So instead of asking it to set default_automatic_abbrev as a side-effect, let's just have find_unique_abbrev() pick the right place to start its loop. This requires a separate approximate_object_count() function, but that naturally belongs with the rest of sha1_file.c. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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