[wp-trac] [WordPress Trac] #38929: WP_Hook should support filters added manually through `advanced-cache.php`

[WordPress Trac]

#38929: WP_Hook should support filters added manually through `advanced-cache.php`
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 Reporter:  dd32          |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  4.7
Component:  Plugins       |     Version:
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by dd32):

 As noted in slack, I'll also mention that there's the possibility we
 could've simply used a new variable `$wp_filter_hooks` (for example) and
 migrated added hooks over as needed (instead of calling
 `WP_Hook::build_preinitialized_hooks()`)  - this would've have the ability
 of avoiding any lost hooks and fatal errors, but while having all our
 public API's continue to work.

 I can't really see any downside to that, but given the lack of bug reports
 during 4.7, and the ability to support the most common example I can think
 of (Batcache) through [attachment:38929.diff] I don't see the need to
 explore that option further at this point - anyone modifying `$wp_filter`
 directly shouldn't probably be doing so anyway after WordPress loads.

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Ticket URL: <https://core.trac.wordpress.org/ticket/38929#comment:1>
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