Weston Ruter 3ed6bbf4a4 Customize: Link elements prior to embedding to prevent possible errors when a control is associated with a non-existent section.
Fixes issue specifically with attempting to access an orphaned control's `elements` immediately after it has been added. Normally this would not happen because a control would not be registered without a section, and also a control should only be interacted with once its `embedded` deferred has been resolved.

Also harden logic for gathering list of deferred setting IDs.

See #37964.
Fixes #42330.

Built from https://develop.svn.wordpress.org/trunk@42024


git-svn-id: http://core.svn.wordpress.org/trunk@41858 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2017-10-25 16:49:49 +00:00
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2017-09-21 16:35:48 +00:00
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