[wp-trac] [WordPress Trac] #62471: Fix malformed variation selector in theme.json when block uses non-trival CSS selector

[WordPress Trac]

#62471: Fix malformed variation selector in theme.json when block uses non-trival
CSS selector
-----------------------------+-----------------------------
 Reporter:  aaronrobertshaw  |      Owner:  (none)
     Type:  defect (bug)     |     Status:  new
 Priority:  normal           |  Milestone:  Awaiting Review
Component:  Editor           |    Version:  trunk
 Severity:  normal           |   Keywords:  gutenberg-merge
  Focuses:                   |
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 This ticket tracks the backport of PHP files for the following Gutenberg
 updates:

 https://github.com/WordPress/gutenberg/pull/67061

 The old approach to converting a block's CSS selectors for block style
 variations was fairly simplistic. It worked when a block used a simple
 class based selector however as blocks evolve and the Selectors API is
 used more, it needs to handle more complex selectors such as the List
 block's `.wp-block-list:not(.wp-block-list .wp-block-list)`.

 The changes in the linked Gutenberg PR prevent generation of malformed
 block style variation selectors when a block's selector leverages a CSS
 function such as `:not()` or chains multiple classes e.g. `.wp-block-list
 .my-custom-class`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/62471>
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