removeUnusedAtRules doesn't work when there are multiple rules per font

[clarfonthey]

Minimal example:

@font-face {
    font-family: font;
    font-weight: regular;
}
@font-face {
    font-family: font;
    font-weight: bold;
}

This will minify to:

@font-face{font-family:font;font-weight:regular}

Which is wrong.

[clarfonthey]

It appears to be an error in this function: https://github.com/jakubpawlowicz/clean-css/blob/f273443f3d697764777e4618121d780c6894a922/lib/optimizer/level-2/remove-unused-at-rules.js#L112

The check for used font-family rules doesn't check if the block is itself a @font-face block.

[jakubpawlowicz]

👍 it should be checked that way indeed, thanks for digging for the solution

[jakubpawlowicz]

Fixed in 4.1.4!

[clarfonthey]

Thank you!