-webkit-filter saturate() Misinterpreted as Sass Function

[bdkjones]

In my scss file I have this:

@-webkit-keyframes pulse {
    0% { -webkit-filter: saturate(1); }
    50% { -webkit-filter: saturate(1.8); }
    100% { -webkit-filter: saturate(1); }
}

When I compile this file with libsass, it throws the following error:

error: required parameter $amount is missing in call to function saturate

Sass DOES have a function called saturate that takes two parameters: a color and an amount.

But in this case, saturate() is NOT a sass function; it's a standard webkit-filter. Libsass is mistaking this for a sass function when it should not. Ruby Sass compiles the above just fine and recognizes that saturate() is not a sass function in this case.

[bdkjones]

Until this is fixed, the following serves as a hacky workaround:

@-webkit-keyframes pulse {
    0% { -webkit-filter: unquote("saturate(1)"); }
    50% { -webkit-filter: unquote("saturate(1.8)"); }
    100% { -webkit-filter: unquote("saturate(1)"); }
}

[akhleung]

Looks like a dup of #151.