[1m--- /tmp/hej/before.txt[2m 2022-12-09 21:33:03.000000000 +0100[0m
[1m+++ /tmp/hej/after.txt[2m 2022-12-09 21:33:07.000000000 +0100[0m
[36m@@ -1,6 +1,6 @@[0m
Minus to not-minus:
[31m----------------[0m
[32m+xxxxxxxxxxxxxxx[0m
Not-plus to plus:
[31m-yyyyyyyyyyyyyyy[0m
[32m++++++++++++++++[0m
Longer case, minus to plus:
[31m----------------[0m
[32m++++++++++++++++[0m