[wp-trac] [WordPress Trac] #52789: Gallery layout block adds all media items when changing an image

[WordPress Trac]

#52789: Gallery layout block adds all media items when changing an image
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 Reporter:  MikeLittle    |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:  5.7
 Severity:  normal        |   Keywords:
  Focuses:                |
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 ## Steps to reproduce:
 1. Have multiple items already added to the media library.
 2. Create a new post
 3. Drag a the Gallery pattern (two images side by side)
 4. Select one image
 5. Click media library
 6. Select ONE image
 7. Click Add to gallery
 8. All images are selected
 9. Click update gallery
 10. All images are added to the gallery

 ## Expected behaviour
 Only one image is added to the gallery

 I'm not sure whether the bug is in the block or the media library. There
 were no errors or warnings in the JS Console

 Running WordPress under 'wplocal' (flywheel/wpengine).
 PHP 7.4.1
 Browser: Chrome 88.0.4324.192

 Video demo of the issue: https://vimeo.com/522746498/0ca3c5a137

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Ticket URL: <https://core.trac.wordpress.org/ticket/52789>
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