Tonya Mork b90fe46a6e Editor: Fix block custom CSS pseudo element selectors in global styles.
Fixes a regression introduced in [58241] where selectors with pseudo elements are wrapped within `:where()` causing malformed CSS and the CSS rule(s) not being applied.

When processing custom CSS for blocks, this changeset:

* Strips the pseudo-elements from the original nested selector, performs the required wrapping in `:root :where`, then re-appends the pseudo-element selector with its leading combinators if present.
* Removes empty CSS rules.

It includes the PHP changes.

Reference:
* PHP changes from [https://github.com/WordPress/gutenberg/pull/63980 Gutenberg PR 63980].

Follow-up to [58241], [56812], [55216].

Props aaronrobertshaw, wongjn, harlet7, dballari, ramonopoly, andrewserong, aristath, hellofromTonya.
Fixes #61769.

git-svn-id: https://develop.svn.wordpress.org/trunk@58896 602fd350-edb4-49c9-b593-d223f7449a82
2024-08-14 18:55:26 +00:00
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