bug in diff

[James Roy]

Exclusion of differing lines based on a RE seems to work only if the NEXT line 
is the same in both files.

Here's an example of what I mean.

===============
address@hidden:~$ diff -I line zap zap2
3,4c3,4
< line 22
< y
---
> line 2
> z
address@hidden:~$ cat zap
line 11
x
line 22
y
address@hidden:~$ cat zap2
line 1
x
line 2
z
address@hidden:~$ diff -v
diff (GNU diffutils) 2.8.1
Copyright (C) 2002 Free Software Foundation, Inc.
=====================

My appologies if this is a known bug.  First I've found, not sure how to 
discover if it's old 
-- 
Jim Roy