diffcore-rename: make diff-tree -l0 mean -l<large>
In the documentation of diff-tree, it is stated that the -l option "prevents rename/copy detection from running if the number of rename/copy targets exceeds the specified number". The documentation does not mention any special handling for the number 0, but the implementation before commit 9f7e4bfa ("diff: remove silent clamp of renameLimit", 2017-11-13) treated 0 as a special value indicating that the rename limit is to be a very large number instead. The commit 9f7e4bfa changed that behavior, treating 0 as 0. Revert this behavior to what it was previously. This allows existing scripts and tools that use "-l0" to continue working. The alternative (to have "-l0" suppress rename detection) is probably much less useful, since users can just refrain from specifying -M and/or -C to have the same effect. Signed-off-by: NJonathan Tan <jonathantanmy@google.com> Reviewed-by: NJonathan Nieder <jrnieder@gmail.com> Reviewed-by: NElijah Newren <newren@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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