grep: fix -zxP bug

* NEWS: Document this.
* src/pcresearch.c (Pcompile): Search a line at a time if -x is
used, since -x uses ^ and $.
* tests/pcre: Test this.

1 files changed, 1 insertions, 0 deletions

diff --git a/tests/pcre b/tests/pcre
index 653ef221..a290099a 100755
--- a/tests/pcre
+++ b/tests/pcre
@@ -17,5 +17,6 @@ echo | grep -zP '\s$' || fail=1
 echo '.ab' | returns_ 1 grep -Pwx ab || fail=1
 echo x | grep -Pz '[^a]' || fail=1
 printf 'x\n\0' | returns_ 1 grep -zP 'x$' || fail=1
+printf 'a\nb\0' | grep -zxP a && fail=1
 
 Exit $fail