scss/operator-no-unspaced rule fails on negative numbers in interpolated values

[sergeyDevjatov]

This is similar issue to #450

There is no fails

$fooBarFooBarFooBarFooBarFooBarFooBarFooBarFooBarFooBarFooBarFooBar: color.scale(
  #000000,
  $lightness: -50%,
  $alpha: -50%
);

In this case which similar to case above there is fails on $lightness and $alpha values

$fooBarFooBarFooBarFooBarFooBarFooBarFooBarFooBarFooBarFooBarFooBar: #{color.scale(
    #000000,
    $lightness: -50%,
    $alpha: -50%
  )};

In this case there is fail on $lightness value

$c: #{color.scale(#000000, $lightness: -50%, $alpha: -50%)};

It's reproduced with stylelint-scss@4.6.0 and stylelint@15.4.0

[kristerkari]

Thanks! Sounds like a bug.