[wp-trac] [WordPress Trac] #37980: Don't attach events to customizer section headings with cannot-expand class

[WordPress Trac]

#37980: Don't attach events to customizer section headings with cannot-expand class
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 Reporter:  celloexpressions  |      Owner:
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  4.7
Component:  Customize         |    Version:  4.3
 Severity:  normal            |   Keywords:  needs-patch good-first-bug
  Focuses:  javascript        |
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 Back when the customizer used `accordion.js`, the `.cannot-expand` class
 could be added to section headings that couldn't be expanded to prevent JS
 events and hover/focus styles from being applied. While the class
 continues to prevent styles from being applied (and is used in a couple
 places for core), JS events seem to be added now and those should be
 removed. See
 https://wordpress.slack.com/archives/themereview/p1473274466001022.

 The fix should be reasonably straightforward - bailing early from
 `attachEvents()` or `onChangeExpanded()` in the section JS in `customize-
 controls.js` if the event target has class cannot-expand - so I'm marking
 as a good first bug for now if anyone's interested in tackling it.

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Ticket URL: <https://core.trac.wordpress.org/ticket/37980>
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