[wp-trac] [WordPress Trac] #38523: Customizer background UI erroneously presumes existence of controls and settings

[WordPress Trac]

#38523: Customizer background UI erroneously presumes existence of controls and
settings
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 Reporter:  westonruter   |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  4.7
Component:  Customize     |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Follow-up on #22058 (Improve custom background properties UI) and
 changeset r38948.

 The new background properties UI code assumes that the various controls
 and settings all exist for the various background properties. However, a
 theme may remove any of these controls. I noticed this in the Make theme,
 in which an error is raised when attempting to toggle the visibility of
 the `background_attachment` control.

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Ticket URL: <https://core.trac.wordpress.org/ticket/38523>
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