Grep bug with highliting

[Vallimar]

Using grep 2.5e, I ran a grep on a large file with the
--colour option set.  After letting the test run for a bit,
I did a ctrl-c to break out of the execution but that caused
the highlighting to become stuck always on inside my current
shell.  After running a quick grep with the same option and
letting it terminate normally, it properly reset the colour
attributes for my terminal.  Just something you may wish to
investigate if you find the time.