rerere: adjust 'forget' to multi-variant world order

Because conflicts with the same contents inside conflict blocks
enclosed by "<<<<<<<" and ">>>>>>>" can now have multiple variants
to help three-way merge to adjust to the differences outside the
conflict blocks, "rerere forget $path" needs to be taught that there
may be multiple recorded resolutions that share the same conflict
hash (which groups the conflicts with "the same contents inside
conflict blocks"), among which there are some that would not be
relevant to the conflict we are looking at.  These "other variants"
that happen to share the same conflict hash should not be cleared,
and the variant that would apply to the current conflict may not be
the zero-th one (which is the only one that is cleared by the
current code).

After finding the conflict hash, iterate over the existing variants
and try to resolve the conflict using each of them to find the one
that "cleanly" resolves the current conflict.  That is the one we
want to forget and record the preimage for, so that the user can
record the corrected resolution.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

rerere.c

@@ -1038,7 +1038,33 @@ static int rerere_forget_one_path(const char *path, struct string_list *rr)
 
 	/* Nuke the recorded resolution for the conflict */
 	id = new_rerere_id(sha1);
-	id->variant = 0; /* for now */
+
+	for (id->variant = 0;
+	     id->variant < id->collection->status_nr;
+	     id->variant++) {
+		mmfile_t cur = { NULL, 0 };
+		mmbuffer_t result = {NULL, 0};
+		int cleanly_resolved;
+
+		if (!has_rerere_resolution(id))
+			continue;
+
+		handle_cache(path, sha1, rerere_path(id, "thisimage"));
+		if (read_mmfile(&cur, rerere_path(id, "thisimage"))) {
+			free(cur.ptr);
+			return error("Failed to update conflicted state in '%s'",
+				     path);
+		}
+		cleanly_resolved = !try_merge(id, path, &cur, &result);
+		free(result.ptr);
+		free(cur.ptr);
+		if (cleanly_resolved)
+			break;
+	}
+
+	if (id->collection->status_nr <= id->variant)
+		return error("no remembered resolution for '%s'", path);
+
 	filename = rerere_path(id, "postimage");
 	if (unlink(filename))
 		return (errno == ENOENT

t/t4200-rerere.sh

@@ -536,6 +536,16 @@ test_expect_success 'multiple identical conflicts' '
 	test_cmp file1.expect file1 &&
 	test_cmp file2.expect file2 &&
 
+	# Forget resolution for file2
+	git rerere forget file2 &&
+	echo file2 >expect &&
+	git rerere status >actual &&
+	test_cmp expect actual &&
+	count_pre_post 2 1 &&
+
+	# file2 already has correct resolution, so record it again
+	git rerere &&
+
 	# Pretend that the resolutions are old again
 	find .git/rr-cache/ -type f | xargs test-chmtime -172800 &&