[wp-trac] [WordPress Trac] #55179: Backport bugfixes from Gutenberg into Core for WP 5.9.1

[WordPress Trac]

#55179: Backport bugfixes from Gutenberg into Core for WP 5.9.1
----------------------------+---------------------
 Reporter:  audrasjb        |       Owner:  (none)
     Type:  task (blessed)  |      Status:  new
 Priority:  normal          |   Milestone:  5.9.1
Component:  Editor          |     Version:
 Severity:  normal          |  Resolution:
 Keywords:  has-patch       |     Focuses:
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Comment (by audrasjb):

 In [changeset:"52746" 52746]:
 {{{
 #!CommitTicketReference repository="" revision="52746"
 Themes: Allow extending `WP_Theme_JSON` and `WP_Theme_JSON_Resolver`
 classes.

 This change updates methods visibility from `private` to `protected` and
 adds late static binding.

 Original PRs from Gutenberg repository:
 - https://github.com/WordPress/gutenberg/pull/38625
 - https://github.com/WordPress/gutenberg/pull/38671

 Props oandregal, Mamaduka, kapilpaul.
 Merges [52744] to the 5.9 branch.
 Fixes #55178.
 See #55179.
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/55179#comment:6>
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