toggling a comment does not work in Haskell-Cabal mode

[FabArd]

When I want to uncomment a line in the Haskell-Cabal mode it doesn't work if the line starts with a space.

Exemple : if I want to uncomment the above line with C-x C-;
-- other-modules:
will result in
-- -- other-modules:

It seems that uncommenting a line that starts with a space is impossible.
No problem when the line do not start with space : toggling is correct.

[bernhard-herzog]

Is this still a problem? It seems to work fine for me in a current version haskell-mode.

[Hi-Angel]

@bernhard-herzog it's because it works when the comment is at the beginning of a line, but not when there's whitespace before it. For details see PR I just linked to the issue.