removeUnusedAtRules has false positives if quotes don’t match

[Lobstrosity]

If a font family is multi-word and requires quote-wrapping and a rule uses different quote marks than the @font-face declaration does, it marks the @font-face as unused.

Environment

• clean-css@4.1.8
• node@6.9.1
• macOS Sierra

Configuration options

{ level: { 2: { removeUnusedAtRules: true } } }

Input CSS

@font-face{font-family:"Two Words";}h1{font-family:'Two Words';}

Actual output CSS

h1{font-family:'Two Words'}

Expected output CSS

@font-face{font-family:"Two Words";}h1{font-family:'Two Words';}

[jakubpawlowicz]

👍 released in 4.1.9.