[wp-trac] [WordPress Trac] #50508: Customize: Widgets appear "inactive" by default

[WordPress Trac]

#50508: Customize: Widgets appear "inactive" by default
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 Reporter:  afercia       |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  5.5
Component:  Customize     |    Version:  trunk
 Severity:  normal        |   Keywords:  has-screenshots
  Focuses:  javascript    |
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 This appear to be a regression in trunk. I was able to reproduce on two
 different machines.

 - latest trunk
 - no plugins active, Twenty Twenty theme
 - make sure there are some Widgets added in the theme's widget areas
 - go to the Customizer > Widgets > one of the widget areas e.g. the Twenty
 Twenty "Footer 1"
 - observe all the Widgets listed in the left sidebar look "inactive" their
 container gets a CSS `opacity: 0.5`
 - observe it happens also in "reorder mode"
 - all widget boxes are fully functional, they just appear "inactive"
 because of the opacity - they also have an insufficient color contrast
 - compare with latest WordPress stable, where the listed widgets don't get
 the opacity
 - to my understanding, the opacity should only be set on the widgets that
 are _not_ rendered
 - something wrong appears to happen with the `widget-rendered` class,
 which isn't applied

 See attached screenshot, from left to right:
 - trunk: widgets list normal mode
 - trunk: widgets list "reorder" mode
 - 5.4: widgets list normal mode

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Ticket URL: <https://core.trac.wordpress.org/ticket/50508>
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