merge-base: Clarify the comments on post processing.

The comment fooled myself believing that we still had an
unsolved horizon effect.

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

diff --git a/merge-base.c b/merge-base.c
index f0dc06e..4856ca0 100644 (file)
--- a/merge-base.c
+++ b/merge-base.c
@@ -82,8 +82,9 @@ static struct commit *interesting(struct commit_list *list)
  * commit B.
  *
  *
- * Another pathological example how this thing can fail to mark an ancestor
- * of a merge base as UNINTERESTING without the postprocessing phase.
+ * Another pathological example how this thing used to fail to mark an
+ * ancestor of a merge base as UNINTERESTING before we introduced the
+ * postprocessing phase (mark_reachable_commits).
  *
  *               2
  *               H
@@ -118,7 +119,9 @@ static struct commit *interesting(struct commit_list *list)
  *      D7                     2 3 7 7 3 2 1 2
  *      E7                     2 3 7 7 7 2 1 2
  *
- * and we end up showing E as an interesting merge base.
+ * and we ended up showing E as an interesting merge base.
+ * The postprocessing phase re-injects C and continues traversal
+ * to contaminate D and E.
  */
 
 static int show_all = 0;