[wp-trac] [WordPress Trac] #36276: Refreshed Customizer preview iframe shows before initialized

[WordPress Trac]

#36276: Refreshed Customizer preview iframe shows before initialized
------------------------------+--------------------------
 Reporter:  westonruter       |       Owner:  westonruter
     Type:  defect (bug)      |      Status:  accepted
 Priority:  normal            |   Milestone:  4.5
Component:  Customize         |     Version:  trunk
 Severity:  normal            |  Resolution:
 Keywords:  has-patch commit  |     Focuses:
------------------------------+--------------------------
Changes (by westonruter):

 * keywords:  has-patch needs-testing => has-patch commit
 * owner:   => westonruter
 * status:  new => accepted


Comment:

 @celloexpressions @afercia The whole point of the patch is to ensure the
 secondary `iframe` is not accessible. Only the first `iframe` should be
 displayed because it is the one that is fully loaded. Once the secondary
 `iframe` is fully loaded, then the primary (first) `iframe` gets destroyed
 and removed, so that the secondary `iframe` becomes the primary one. And
 at this point it will be visible.

 It is also important to note that once transactions (#30937) are
 implemented, there should only ever be one iframe that is just reloaded,
 so this issue will be obsolete.

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Ticket URL: <https://core.trac.wordpress.org/ticket/36276#comment:8>
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