This option is added in commit b73bcbac4a (diff: allow
--no-color-moved-ws - 2018-11-23) in pw/diff-color-moved-ws-fix. To ease
merge conflict resolution, re-implement the option handling here so that
the conflict could be resolved by taking this side of change.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>