this change will make all commit hashes align at 20th column from
the edge of the terminal, not from the edge of the graph.
Signed-off-by: Josef Kufner <josef@kufner.cz> Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>