Fix unit-no-unknown false positives for the second and subsequent image-set() with x descriptor

[romainmenke]

Which issue, if any, is this issue related to?

See : #6848
Supersedes : #6726

Is there anything in the PR that needs further explanation?

• this will fail because it uses unreleased features of the media query parser
• also happens to resolve Fix unit-no-unknown false positives for the second and subsequent image-set() with x descriptor #6726

before :

npm run benchmark-rule unit-no-unknown true
Warnings: 0
Mean: 143.3089323125 ms
Deviation: 10.593647978441565 ms

after :

npm run benchmark-rule unit-no-unknown true
Warnings: 0
Mean: 109.86287500000002 ms
Deviation: 9.320724134887374 ms

[changeset-bot]

🦋 Changeset detected

Latest commit: d453ed1

The changes in this PR will be included in the next version bump.

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[romainmenke]

@ybiquitous I intended to just change the parser here, but this change also had the side effect of fixing an issue.

I propose changing the title and adding the correct changelog for that:

Fix `unit-no-unknown` false positives for the second and subsequent `image-set()` with `x` descriptor

I would also add chalkygames123 as a co-author as they wrote the tests that I used to verify the fix in #6726

[ybiquitous]

Yes, that's a good idea on #6879 (comment)

Please update them!

[ybiquitous]

Thank you. LGTM 👍🏼