[wp-trac] [WordPress Trac] #54583: Add `__unstableGalleryWithImageBlocks` block editor setting for 5.9 release

[WordPress Trac]

#54583: Add `__unstableGalleryWithImageBlocks` block editor setting for 5.9 release
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 Reporter:  glendaviesnz             |       Owner:  (none)
     Type:  defect (bug)             |      Status:  new
 Priority:  normal                   |   Milestone:  5.9
Component:  Editor                   |     Version:  trunk
 Severity:  normal                   |  Resolution:
 Keywords:  has-patch needs-testing  |     Focuses:
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Comment (by glendaviesnz):

 I have tested the attached PR with WP 5.9 Beta 2 and the mobile app 18.7
 on android. I was able to view and edit a new format Gallery block that
 was added on web in the mobile app, and also a new gallery block added on
 mobile was in the new format. This shows that this patch is working as
 expected as the mobile app won't add Gallery blocks in the new format
 unless the `__unstableGalleryWithImageBlocks` editor setting is `true`

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Ticket URL: <https://core.trac.wordpress.org/ticket/54583#comment:7>
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