[CSS] Deduplication of minifier is not smart enough

[hyf0]

Describe the feature

For input

body {
  color: red;
}

body {
  color: red;
}

cssnano will discard duplicated rules.

https://cssnano.co/playground/

Babel plugin or link to the feature description

No response

Additional context

Not an urgent request. Just want to bring it up.

[kdy1]

It's already supported by the swc_css_minifier

[hyf0]

@kdy1 I tested locally.

A complicated case like this isn't discarded.

body {
  color: red;
}

h1 {
  color: red;
}

body {
  color: red;
}

CSSnano outout