[Bug] .css file will not Minify if use selector :is()

[atom-tr]

🐞 Bug Report

Describe the bug

• When i use :is(.class1, .class2) in css file, none of any option of extension work

  :is(#idA, .classB) .col { display: none }

• I remove selector :is(), extension work perfectly

  #idA .col, .classB .col  { display: none }

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Is this a regression?

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To Reproduce

1. Use :is()
2. Click Minify
3. Nothing happen

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Expected behaviour

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Media prove

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Your environment

• OS: Ubuntu 20.04.6 LTS
• Node version: v16.13.2
• Npm version: 8.10.0
• Browser name and version: VScode 1.84.0

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Additional context

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