[wp-trac] [WordPress Trac] #58561: Backport: Block theme previews

[WordPress Trac]

#58561: Backport: Block theme previews
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 Reporter:  onemaggie    |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  General      |    Version:
 Severity:  normal       |   Keywords:
  Focuses:               |
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 This PR backports the changes made to the block theme previews. I grouped
 them together instead of having one PR for each change because they would
 all depend on each other, which made more sense.

 Backports:

 https://github.com/WordPress/gutenberg/pull/50030
 https://github.com/WordPress/gutenberg/pull/50335
 https://github.com/WordPress/gutenberg/pull/50338
 https://github.com/WordPress/gutenberg/pull/50354
 https://github.com/WordPress/gutenberg/pull/51221
 https://github.com/WordPress/gutenberg/pull/51312
 https://github.com/WordPress/gutenberg/pull/50983
 https://github.com/WordPress/wordpress-develop/pull/4376

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Ticket URL: <https://core.trac.wordpress.org/ticket/58561>
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