NERDCommenterInvert will not work correctly if there isn't an extra space (Haskell)

[attacker0211]

see this image:

after:

[alerque]

Thanks far taking the time to send a contribution. Unfortunately we've been down this path before and there are known bad side effects of adding spaces to the comment delimiter string. Whether you are working in a language that requires them or just prefer them the current remedy is the same, set:

let g:NERDSpaceDelims = 1

See #421 and the plethora of related linked issues there. Haskell also came up specifically in #420.

I would love to see a fix that overhauled this properly to set the space setting defaults on a per language basis as in №421, but this partial solution has too many side effects to accetp.