[wp-trac] [WordPress Trac] #42115: Customize Menus: Add "Your theme already has a basic menu" view

[WordPress Trac]

#42115: Customize Menus: Add "Your theme already has a basic menu" view
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 Reporter:  melchoyce       |       Owner:  bpayton
     Type:  task (blessed)  |      Status:  assigned
 Priority:  normal          |   Milestone:  4.9
Component:  Customize       |     Version:  trunk
 Severity:  normal          |  Resolution:
 Keywords:                  |     Focuses:  ui
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Comment (by westonruter):

 This is something we'd be able to sniff for via in the preview. In
 particular, when `wp_nav_menu()` is called and falls back to listing
 pages, then a selective refresh partial will still be created. So in that
 case, the partial itself could send a message to the parent window to
 inform it that a given theme location has a fallback populating it.

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Ticket URL: <https://core.trac.wordpress.org/ticket/42115#comment:4>
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