[wp-trac] [WordPress Trac] #31484: Widgets appearing in Customizer preview during a theme preview may not correspond to controls in Widgets panel

[WordPress Trac]

#31484: Widgets appearing in Customizer preview during a theme preview may not
correspond to controls in Widgets panel
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 Reporter:  westonruter   |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  4.1.2
Component:  Customize     |    Version:  4.1
 Severity:  normal        |   Keywords:  needs-patch
  Focuses:  javascript    |
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 When testing the new Theme Switcher in the Customizer, I noticed when
 previewing another theme that the widget controls appearing in the Widgets
 panel were sometimes largely appearing as inactive (partially transparent)
 and the widgets appearing in the Customizer preview did not correspond to
 the widget controls I saw in the Widgets pane. In fact, the widgets in the
 Panel reflected the widgets that were actually from the previously-cached
 widgets configuration (via `retrieve_widgets()` and stored in the
 `sidebars_widgets` theme mod), but the widgets appearing in the Customizer
 preview corresponded to the widget configuration in the currently-active
 theme.

 The problem was introduced in WordPress 4.1, specifically in r29905 for
 #29983, since we're no longer posting all of the settings from the
 Customizer pane to the preview for performance reasons: only the changed
 (dirty) settings get POSTed to the Preview when it is loaded.

 Steps to reproduce:

 1. Activate Twenty Fourteen via the Themes admin page
 2. Add multiple widgets to each sidebar via the Widgets admin page; let
 them have "2014" in their titles
 3. Activate Twenty Thirteen via the Themes admin page
 4. Add multiple widgets to each sidebar (Main Widget Area, Secondary
 Widget Area) via the Widgets admin page; let them have "2013" in their
 titles
 5. Try switching between Twenty Thirteen and Twenty Fourteen and note each
 theme's respective sidebar configurations.
 6. Switch back to Twenty Fourteen via the Themes admin page.
 7. Live-preview the Twenty Thirteen theme either via the Themes admin
 page, or via the new Customizer theme previewer
 8. Open the Widgets panel and note that the widgets listed are correctly
 those for Twenty Thirteen, but notice in the Preview that  the widgets
 from Twenty Fourteen are showing incorrectly.

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Ticket URL: <https://core.trac.wordpress.org/ticket/31484>
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