tree fe3c9a2027ce6a3063c2cf303a312f07d5faae7d
parent 94907aa5349a613e80e42224b6b20f18057d4414
author Benno Schulenberg <bensberg@justemail.net> 1484765631 +0100
committer Benno Schulenberg <bensberg@justemail.net> 1484928190 +0100

painting: stay within the line when skipping zero-length matches

Don't blithely overshoot the end of a line when both start regex and
end regex match an empty string.  Overshooting would let the matching
run on into uncharted country and thus ultimately cause a segfault.

This fixes https://savannah.gnu.org/bugs/?50056.
Reported-by: Elia Geretto <elia.f.geretto@gmail.com>