fela-enforce-longhands: Handle vendor prefixes

[alizeait]

Description

When using vendor prefixed properties or using fela-plugin-prefixer, properties that get a vendor prefix will be skipped from the priority list causing those ones to not have the specificity class selector added.

Packages

List all packages that have been changed.

• fela-enforce-longhands

Versioning

Minor

Checklist

Quality Assurance

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• The code was formatted using Prettier (pnpm run format)
• The code has no linting errors (pnpm run lint)
• All tests are passing (pnpm run test)

Changes

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• Tests have been added/updated
• Documentation has been added/updated

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[alizeait]

Ping @robinweser

[robinweser]

Thanks @alizeait!
I've been out on a scouts camp, so not really able to merge anything.
Release coming soon :)