bug#23357: [PATCH] Don't let `css--property-values' return duplicates

[Simen Heggestøyl]

By a recent discussion on emacs-devel I was made aware that

completion-at-point functions are themselves responsible for removing

duplicate entries in their results.

The attached patch ensures that `css--property-values' doesn't return

duplicate values as it would otherwise do sometimes, along with a

regression test for it.

-- Simen

0001-Don-t-let-css-property-values-return-duplicates.patch
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