[wp-trac] [WordPress Trac] #59456: Editor: Don't enqueue edit site stylesheet in iframe

[WordPress Trac]

#59456: Editor: Don't enqueue edit site stylesheet in iframe
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 Reporter:  Mamaduka      |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  6.4
Component:  Editor        |    Version:  6.3
 Severity:  normal        |   Keywords:  gutenberg-merge
  Focuses:                |
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 Syncs changes from https://github.com/WordPress/gutenberg/pull/54254.

 > The edit-site stylesheet is meant to style UI, not editor content.
 Loading it in the iframe slow it down, and it can potentially clash with
 editor content rules.

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Ticket URL: <https://core.trac.wordpress.org/ticket/59456>
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