This test checks for problems where line endings aren't handled correctly by our pre-scanning of the file.

# https://github.com/beyondgrep/ack2/issues/491
v2.14 with "-l" not emitting all matching files.

> echo ' ' >space-newline.txt
> echo $' \n' >space-newline-newline.txt
> ack ' $' space-newline*.txt
space-newline-newline.txt
1:

space-newline.txt
1:
> ack -l ' $' space-newline*.txt
space-newline.txt