Revert "Make left-right automatic."

This reverts commit 5761231975ceffa531d86d9bab0f9a9a370674f6.

Feeding symmetric difference to gitk is so useful, and it is the
same for other graphical Porcelains.  Rather than forcing them
to pass --no-left-right, making it optional.

Noticed and reported by Jeff King.

1 files changed, 0 insertions, 1 deletions

diff --git a/revision.h b/revision.h
index b2ab814..4585463 100644
--- a/revision.h
+++ b/revision.h
@@ -41,7 +41,6 @@ struct rev_info {
 			limited:1,
 			unpacked:1, /* see also ignore_packed below */
 			boundary:1,
-			no_left_right:1,
 			left_right:1,
 			parents:1;