[wp-trac] [WordPress Trac] #54888: Remove Customizer's Menus section when block theme is active.

[WordPress Trac]

#54888: Remove Customizer's Menus section when block theme is active.
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 Reporter:  hellofromTonya                |       Owner:  (none)
     Type:  defect (bug)                  |      Status:  new
 Priority:  normal                        |   Milestone:  5.9
Component:  Customize                     |     Version:
 Severity:  normal                        |  Resolution:
 Keywords:  needs-patch has-testing-info  |     Focuses:
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Changes (by hellofromTonya):

 * keywords:  needs-patch => needs-patch has-testing-info


Comment:

 Steps to Reproduce:

 1. Start with pre 5.9 version, such as 5.8.3.
 2. Activate a default theme such as TT1 (Twenty Twenty-One).
 3. Add a Main Menu by going to Appearance > Menus and creating a menu and
 assign it to the primary menu.
 4. Open Customizer's Menu section by going to Appearance > Customize >
 Menus.
 5. Upgrade to 5.9 RC3.
    * To upgrade, use either the Beta Tester plugin or wp cli
 ([https://wordpress.org/news/2022/01/wordpress-5-9-rc3/ see instructions
 in RC3 release announcement]).
 6. Activate TT2 (Twenty Twenty-Two) by going to Appearance > Themes.
 7. Refresh Customizer and then reopen Menus section.
 Notice the preview is showing the default header nav of page listings, but
 the Menus section is still showing the previous assigned Main Menu.
 8. Open Site Editor.
 9. Open list view.
 Notice the `Navigation` block and `Page Listing`. This is the default
 setup for TT2.

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Ticket URL: <https://core.trac.wordpress.org/ticket/54888#comment:1>
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