[wp-trac] [WordPress Trac] #35362: Empty `items_wrap` `wp_nav_menu` randomly breaks customizer

[WordPress Trac]

#35362: Empty `items_wrap` `wp_nav_menu` randomly breaks customizer
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 Reporter:  ojrask        |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Customize     |    Version:  4.4
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Assuming a navigation menu is generated in the frontend using
 `wp_nav_menu` and setting the argument `items_wrap` to an empty string
 (`''`).

 Then when toying around with the menu and its items inside the customizer,
 the customizer breaks randomly and begins duplicating the whole menu
 recursively in the preview pane until the browser crashes or is forced to
 quit.

 If the `items_wrap` argument is removed or changed the problem disappears.

 Tested on WP 4.4 with a custom theme.

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Ticket URL: <https://core.trac.wordpress.org/ticket/35362>
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