[wp-trac] [WordPress Trac] #61282: Backport theme.json version 3 migrations

[WordPress Trac]

#61282: Backport theme.json version 3 migrations
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 Reporter:  ajlende                   |       Owner:  ellatrix
     Type:  enhancement               |      Status:  closed
 Priority:  normal                    |   Milestone:  6.6
Component:  General                   |     Version:
 Severity:  normal                    |  Resolution:  fixed
 Keywords:  has-patch has-unit-tests  |     Focuses:
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Comment (by oandregal):

 In [changeset:"58354" 58354]:
 {{{
 #!CommitTicketReference repository="" revision="58354"
 Editor: code quality improvements for theme.json migrate API

 Backports https://github.com/WordPress/gutenberg/pull/62305

 Follow-up to [58328], #61282.

 Props ajlende, oandregal, ramonopoly, mukesh27.
 Fixes #61282.
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/61282#comment:15>
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