completion: small optimization
No need to calculate a new $c with a space if we are not going to do anything it with it. There should be no functional changes, except that a word "foo " with no suffixes can't be matched. But $cur cannot have a space at the end anyway. So it's safe. Based on the code from SZEDER Gábor. Signed-off-by: NFelipe Contreras <felipe.contreras@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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