[wp-trac] [WordPress Trac] #64544: Core GB backport - individual block custom CSS

[WordPress Trac]

#64544: Core GB backport - individual block custom CSS
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 Reporter:  glendaviesnz                         |       Owner:  ellatrix
     Type:  enhancement                          |      Status:  reopened
 Priority:  normal                               |   Milestone:  7.0
Component:  General                              |     Version:  trunk
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch gutenberg-merge fixed-     |     Focuses:
  major dev-reviewed                             |
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Comment (by ellatrix):

 In [changeset:"62376" 62376]:
 {{{
 #!CommitTicketReference repository="" revision="62376"
 Block Supports: Improve performance and hardening of block-level custom
 CSS rendering.

 Short-circuits the custom CSS support filter before the more expensive
 lookups so blocks without custom CSS return faster.

 Replaces the regex class name parsing in
 `wp_render_custom_css_class_name()` with a cheap `str_contains()` guard
 followed by an HTML spec-compliant `strtok()` walk over the className
 tokens. This avoids the regex engine for the common case where no `wp-
 custom-css-` class is present, and correctly handles tab/form-feed/CR/LF
 separators as well as classes such as `my-wp-custom-css-*` that merely
 contain the prefix as a substring after a hyphen.

 Also hardens both functions against malformed parsed blocks (non-string
 `className`, missing keys), tightens `@phpstan-param` array shapes, and
 corrects the `block_has_support()` `@param` to allow `WP_Block_Type|null`.
 Lastly, a `@return Generator<int, non-empty-string>` phpdoc tag is added
 to `WP_HTML_Tag_Processor::class_list()`.

 Developed in https://github.com/WordPress/wordpress-develop/pull/11686 and
 https://github.com/WordPress/gutenberg/pull/78217

 Follow-up to r61678.

 Reviewed by ellatrix.
 Merges [62359] to the 7.0 branch.
 Props mukesh27, westonruter, ramonopoly, jonsurrell.
 See #64544, #64238.
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/64544#comment:31>
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