remote: Make ref_remove_duplicates faster for large numbers of refs
The ref_remove_duplicates function was very slow at dealing with very large numbers of refs. This is because it was using a linear search through all remaining refs to find any duplicates of the current ref. Rewriting it to use a string list to keep track of which refs have already been seen and removing duplicates when they are found is much more efficient. Signed-off-by: NJulian Phillips <julian@quantumfyre.co.uk> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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