[wp-trac] [WordPress Trac] #61769: Global Styles: Prevent empty CSS rules and malformed selectors for custom css for blocks

[WordPress Trac]

#61769: Global Styles: Prevent empty CSS rules and malformed selectors for custom
css for blocks
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 Reporter:  aaronrobertshaw  |      Owner:  (none)
     Type:  defect (bug)     |     Status:  new
 Priority:  normal           |  Milestone:  6.6.2
Component:  Editor           |    Version:  trunk
 Severity:  normal           |   Keywords:  gutenberg-merge
  Focuses:                   |
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 This ticket tracks the backporting of PHP files for the following
 Gutenberg changes:
 - https://github.com/WordPress/gutenberg/pull/63980

 These changes fix two issues with the generation of custom css for blocks
 with Global Styles.

 1. Empty CSS rules e.g. `:root :where(.wp-block-heading){}`
 2. Malformed pseudo element selectors `:root :where(.wp-block-
 heading::before)`

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Ticket URL: <https://core.trac.wordpress.org/ticket/61769>
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