bash completion: only show 'log --merge' if merging
The gitk completion only shows --merge if MERGE_HEAD is present. Do it the same way for git-log completion. Signed-off-by: NThomas Rast <trast@student.ethz.ch> Acked-by: NShawn O. Pearce <spearce@spearce.org> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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