[wp-trac] [WordPress Trac] #56283: Add "Block Theme" filter under "Add themes"

[WordPress Trac]

#56283: Add "Block Theme" filter under "Add themes"
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 Reporter:  luminuu                  |       Owner:  (none)
     Type:  feature request          |      Status:  new
 Priority:  normal                   |   Milestone:  6.1
Component:  Themes                   |     Version:
 Severity:  major                    |  Resolution:
 Keywords:  has-patch dev-feedback   |     Focuses:  ui, accessibility,
  needs-testing has-screenshots      |  administration
  needs-docs needs-user-docs needs-  |
  dev-note                           |
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Comment (by luminuu):

 @audrasjb I've left a review comment on the PR as it's not working for me
 atm, I think the changes I suggested should make it work :)

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Ticket URL: <https://core.trac.wordpress.org/ticket/56283#comment:8>
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