[PATCH v6 3/5] [RFC] Handle the simpler case of a subdir invalidating bulk move.

@@ -596,10 +596,52 @@ static void check_one_bulk_move(struct diff_filepair *dstpair)
 	    maybe_disqualify_bulkmove(one_parent_path, one_leftover))
 		return;
 
+	fprintf(stderr, "[] %s -> %s ?\n",dstpair->one->path, dstpair->two->path);
+
+	// FIXME: loop over successive prefixes
+	unsigned needs_adding = 1;
+
 	/* already considered ? */
-	for (seen=bulkmove_candidates; seen; seen = seen->next)
-		if (!strcmp(seen->one->path, one_parent_path)) break;
-	if (!seen) { /* record potential dir rename */
+	for (seen=bulkmove_candidates; seen; seen = seen->next) {
+		if (seen->discarded) {
+			/* already seen a rename from seen->one to some than ->two */
+			needs_adding = 0;
+			continue;
+		}
+		/* check exact dir */
+		if (!strcmp(seen->one->path, one_parent_path)) {
+			/* already added */
+			needs_adding = 0;
+			/* check that seen entry matches this rename */
+			if (strcmp(two_parent_path, seen->two->path)) {
+				fprintf(stderr, "[DBG] discarding dir %s from bulk moves (split into %s and %s)\n",
+					seen->one->path, two_parent_path, seen->two->path);
+				// FIXME: may be worth to free it instead
+				seen->discarded = 1;
+			}
+			continue;
+		}
+		if (!prefixcmp(one_parent_path, seen->one->path)) {
+			if (prefixcmp(two_parent_path, seen->two->path)) {
+				fprintf(stderr, "[DBG] discarding dir %s from bulk moves (split into %s and %s)\n",
+					seen->one->path, two_parent_path, seen->two->path);
+				// FIXME: may be worth to free it instead
+				seen->discarded = 1;
+				continue;
+			}
+		} else {
+			fprintf(stderr, "[DBG]  %s considered irrelevant for %s -> %s\n",
+				dstpair->one->path, seen->one->path, seen->two->path);
+			continue;
+		}
+
+		/* dstpair confirms seen */
+		fprintf(stderr, "[DBG] %s -> %s DOES NOT cause discard of %s -> %s\n",
+			dstpair->one->path, dstpair->two->path,
+			seen->one->path, seen->two->path);
+	}
+	if (needs_adding) { /* record potential dir rename */
+		/* all checks ok, we keep that entry */
 		seen = xmalloc(sizeof(*seen));
 		seen->one = alloc_filespec(one_parent_path);
 		fill_filespec(seen->one, null_sha1, S_IFDIR);

@@ -614,17 +656,6 @@ static void check_one_bulk_move(struct diff_filepair *dstpair)
 			one_parent_path, two_parent_path);
 		return;
 	}
-	if (seen->discarded)
-		/* already seen a rename from seen->one to some than ->two */
-		return;
-	/* check that seen entry matches this rename */
-	if (strcmp(two_parent_path, seen->two->path)) {
-		fprintf(stderr, "[DBG] discarding dir %s from bulk moves (split into %s and %s)\n",
-			one_parent_path, two_parent_path, seen->two->path);
-		seen->discarded = 1;
-	}
-
-	/* all checks ok, we keep that entry */
 }
 
 /*