invalid quotes around "normal" line-height in font shorthand property

[mahtd]

This is a regression in 3.3.0 beta from 3.2.5

Specifying font: <font-size>/<line-height> <font-family> works fine, but adding of the other properties to the font shorthand results in quotes around the line-height when the normal keyword is used. This is considered invalid by the browser (at least in Chrome and Firefox) and property is ignored.

Input:

a {
    font: 12px/normal serif;
}

b {
    font: normal 12px/normal serif;
}

Output libsass 3.2.5:

a {
  font: 12px/normal serif; }

b {
  font: normal 12px/normal serif; }

Output libsass 3.3.0-beta2:

a {
  font: 12px/normal serif; }

b {
  font: normal 12px/"normal" serif; }

[saper]

Testcase added with sass/sass-spec#512

[mahtd]

Looks like 06ad34e is the one that broke it

[xzyfer]

I cannot reproduce on 997c86d

[xzyfer]

My mistake.

[xzyfer]

I have a fix for this. Will publish when I'm home.