[wp-trac] [WordPress Trac] #42330: JS error while adding new item to menu using theme customiser.

[WordPress Trac]

#42330: JS error while adding new item to menu using theme customiser.
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 Reporter:  prajaktag     |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  4.9
Component:  Customize     |     Version:  trunk
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by westonruter):

 The reason for the error is that theme is doing
 `$wp_customize->remove_section( 'header_image')` and
 `$wp_customize->add_section( 'background_image')`, but it is not
 subsequently changing the `section` for the controls that were in the
 `header_image` section. So the `background_repeat` control is getting
 added to the Customizer without a containing section. Because of this, the
 `embedded` deferred is never resolved because of this:
 https://github.com/WordPress/wordpress-develop/blob/a33d615/src/wp-
 admin/js/customize-controls.js#L3578-L3590

 And since the `control.linkElements()` is currently being called once
 `embedded` is deferred, the `elements` then never get created. And this is
 why the error is happening.

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Ticket URL: <https://core.trac.wordpress.org/ticket/42330#comment:4>
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