[wp-trac] [WordPress Trac] #31789: Themes: allow a pre filter in `wp_prepare_themes_for_js()`

[WordPress Trac]

#31789: Themes: allow a pre filter in `wp_prepare_themes_for_js()`
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 Reporter:  mattwiebe    |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Themes       |    Version:  trunk
 Severity:  normal       |   Keywords:
  Focuses:               |
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 On a site like WordPress.com which has ~450 themes,
 `wp_prepare_themes_for_js()` is very slow. Unfortunately there isn't a
 `pre_` filter that lets us short-circuit the manual labour every time it's
 called. Fortunately adding one is easy!

 This becomes more important in the context of theme browsing in the
 Customizer, which needs to call this every time a different theme is
 previewed there.

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Ticket URL: <https://core.trac.wordpress.org/ticket/31789>
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