[wp-trac] [WordPress Trac] #27538: Widget Customizer: Persistent object cache causes previewed widgets to leak outside of customizer

[WordPress Trac]

#27538: Widget Customizer: Persistent object cache causes previewed widgets to leak
outside of customizer
--------------------------+-------------------
 Reporter:  westonruter   |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  3.9
Component:  Widgets       |    Version:  trunk
 Severity:  normal        |   Keywords:
  Focuses:                |
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 With a persistent/external object cache plugin present (e.g. Memcached
 Object Cache), widgets which output buffer and cache their frontend output
 (the their `widget()` method)s will leak outside of the customizer preview
 onto the site frontend. Two core widgets exhibit this behavior: Recent
 Posts and Recent Comments.

 1. Add a Recent Posts widget to a widget area in the customizer and then
 save.
 2. Go to the frontend to see the widget as configured
 3. Go into the customizer and change the title of the Recent Posts widget
 and preview the change
 4. Leave the customizer and see that the changed widget title persists.

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Ticket URL: <https://core.trac.wordpress.org/ticket/27538>
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