--- /tmp/hej/before.txt 2022-12-09 21:33:03.000000000 +0100
+++ /tmp/hej/after.txt 2022-12-09 21:33:07.000000000 +0100
@@ -1,6 +1,6 @@
Minus to not-minus:
----------------
+xxxxxxxxxxxxxxx
Not-plus to plus:
-yyyyyyyyyyyyyyy
++++++++++++++++
Longer case, minus to plus:
----------------
++++++++++++++++