[wp-trac] [WordPress Trac] #55178: Allow fully extending WP_Theme_JSON and WP_Theme_JSON_Resolver classes

[WordPress Trac]

#55178: Allow fully extending WP_Theme_JSON and WP_Theme_JSON_Resolver classes
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 Reporter:  Mamaduka      |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Themes        |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Allow fully extending `WP_Theme_JSON` and `WP_Theme_JSON_Resolver`
 classes.

 This requires changing method visibility from `private` to `protected` and
 using late static binding.

 Original PRs from Gutenberg repo:

 * https://github.com/WordPress/gutenberg/pull/38625
 * https://github.com/WordPress/gutenberg/pull/38671

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Ticket URL: <https://core.trac.wordpress.org/ticket/55178>
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