[wp-trac] [WordPress Trac] #31151: Pass $instance variable to post_gallery, post_playlist filters

[WordPress Trac]

#31151: Pass $instance variable to post_gallery, post_playlist filters
-------------------------+-----------------------------
 Reporter:  justincwatt  |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Media        |    Version:  4.1
 Severity:  normal       |   Keywords:
  Focuses:               |
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 `gallery_shortcode()` and `wp_playlist_shortcode()` keep track of the
 number of times they're called with a static variable, `$instance`. This
 variable is important so that content (e.g. CSS) can be included only on
 the first function call, or so that unique IDs can be generated for HTML
 tags.

 The problem is that this instance variable is not made available to their
 respective filters, `post_gallery` and `post_playlist`, unlike their
 shortcode siblings, `wp_audio_shortcode()` and `wp_video_shortcode()`,
 both of which pass the instance variable to their filters. Which means
 that any plugins seeking to adapt the behavior of these shortcodes do not
 have access to the same data as core.

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Ticket URL: <https://core.trac.wordpress.org/ticket/31151>
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