Re: [RFH] filter-branch: ancestor detection weirdness

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index 182822a..52b2bdf 100755
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh

@@ -325,15 +325,9 @@ while read ref
 do
 	sha1=$(git rev-parse "$ref"^0)
 	test -f "$workdir"/../map/$sha1 && continue
-	# Assign the boundarie(s) in the set of rewritten commits
-	# as the replacement commit(s).
-	# (This would look a bit nicer if --not --stdin worked.)
-	for p in $( (cd "$workdir"/../map; ls | sed "s/^/^/") |
-		git rev-list $ref --boundary --stdin |
-		sed -n "s/^-//p")
-	do
-		map $p >> "$workdir"/../map/$sha1
-	done
+	# Assign the first commit not pruned as the replacement.
+	candidate=$(git rev-list $ref -1 -- "$filter_subdir")