[wp-trac] [WordPress Trac] #42024: Customizer: Add "customization locking"

[WordPress Trac]

#42024: Customizer: Add "customization locking"
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 Reporter:  melchoyce        |      Owner:
     Type:  feature request  |     Status:  new
 Priority:  normal           |  Milestone:  4.9
Component:  Customize        |    Version:
 Severity:  normal           |   Keywords:  needs-patch
  Focuses:                   |
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 Let's introduce locking to the Customizer, so it's harder to accidentally
 overwrite someone else's concurrent changes. This is especially important
 when multiple people are collaborating on building the same site.

 See attached mockup.

 Related: #31897, #31436

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Ticket URL: <https://core.trac.wordpress.org/ticket/42024>
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