I am using the latest version of EmEditor, and I notice that it still doesn't have support for the Unicode line separator (http://www.fileformat.info/info/unicode/char/2028/index.htm).
I use Wenlin a lot -- unfortunately, I'm kind of stuck with Wenlin 2, since I've customized the dictionary a lot. Wenlin 2 doesn't allow me to change what character it uses for newlines -- it wants to use U+2028.
Anyway, regardless, I think EmEditor, which boasts unicode support, should support it.