Make left-right automatic.

When using symmetric differences, I think the user almost always
would want to know which side of the symmetry each commit came
from.  So this removes --left-right option from the command
line, and turns it on automatically when a symmetric difference
is used ("git log --merge" counts as a symmetric difference
between HEAD and MERGE_HEAD).

Just in case, a new option --no-left-right is provided to defeat
this, but I do not know if it would be useful.

Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/revision.h b/revision.h
index 4585463a44..b2ab81488c 100644
--- a/revision.h
+++ b/revision.h
@@ -41,6 +41,7 @@ struct rev_info {
 			limited:1,
 			unpacked:1, /* see also ignore_packed below */
 			boundary:1,
+			no_left_right:1,
 			left_right:1,
 			parents:1;