[PATCH 1/2] combine-diff: abort if --ignore-matching-lines is given

["René Scharfe" <l.s.r@web.de>]

The code for combined diffs doesn't currently support ignoring changes
that match a regex.  Abort and report that fact instead of running into
a segfault.

Signed-off-by: René Scharfe <l.s.r@web.de>
---
 combine-diff.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/combine-diff.c b/combine-diff.c
index b724f02123..11df1d7f39 100644
--- a/combine-diff.c
+++ b/combine-diff.c
@@ -1498,6 +1498,10 @@ void diff_tree_combined(const struct object_id *oid,
 	int i, num_paths, needsep, show_log_first, num_parent = parents->nr;
 	int need_generic_pathscan;

+	if (opt->ignore_regex_nr)
+		die("combined diff and '%s' cannot be used together",
+		    "--ignore-matching-lines");
+
 	/* nothing to do, if no parents */
 	if (!num_parent)
 		return;
--
2.36.1