[wp-trac] [WordPress Trac] #32630: Introduce has_nav_menu filter

[WordPress Trac]

#32630: Introduce has_nav_menu filter
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 Reporter:  westonruter      |      Owner:
     Type:  feature request  |     Status:  new
 Priority:  normal           |  Milestone:  4.3
Component:  Menus            |    Version:  3.0
 Severity:  normal           |   Keywords:
  Focuses:                   |
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 For Menu Customizer (#32576) to preview changes with partial refresh, we
 need to know which menu locations are used on a given template. In Twenty
 Fifteen, the `wp_nav_menu` calls are wrapped in a `has_hav_menu()` checks,
 meaning that the hooks that fire in `wp_nav_menu` will not be triggered if
 there was no menu assigned to the location up-front. So in the same way
 that we have a `is_sidebar_active()` function and a corresponding
 `is_active_sidebar` filter, we also should have a `has_nav_menu` filter
 accompany the `has_hav_menu()` function.

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Ticket URL: <https://core.trac.wordpress.org/ticket/32630>
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