[wp-trac] [WordPress Trac] #35855: Let selective refresh component be required but be opt-in for sidebars/widgets (for now)

[WordPress Trac]

#35855: Let selective refresh component be required but be opt-in for
sidebars/widgets (for now)
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 Reporter:  DrewAPicture    |       Owner:  westonruter
     Type:  task (blessed)  |      Status:  accepted
 Priority:  normal          |   Milestone:  4.5
Component:  Customize       |     Version:  trunk
 Severity:  blocker         |  Resolution:
 Keywords:  has-patch       |     Focuses:
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Comment (by westonruter):

 Replying to [comment:34 obenland]:
 > That sounds like an argument to let themes add selective refresh support
 the same way they add postMessage support. Which might not be the worst
 compromise.

 I meant in the same what they that have to do “something” to add support,
 not specifically the via the mechanics of adding an additional
 `...->transport = 'postMessage'` line to their theme code. That's not
 applicable because opt-in for selective refresh of widgets would add
 `postMessage` transport to _all_ widget-related settings, as well as being
 the default transport for new widgets added. But since individual widgets
 also have to indicate support to be eligible for selective refresh, the
 transport can only added once both requirements are satisfied. So this is
 why a more meta-level flag is needed, like a theme support feature.

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Ticket URL: <https://core.trac.wordpress.org/ticket/35855#comment:35>
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