[wp-trac] [WordPress Trac] #52342: Update copy_dir and _copy_dir for $dirlist error reporting

[WordPress Trac]

#52342: Update copy_dir and _copy_dir for $dirlist error reporting
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 Reporter:  afragen          |      Owner:  (none)
     Type:  enhancement      |     Status:  new
 Priority:  normal           |  Milestone:  5.7
Component:  Upgrade/Install  |    Version:
 Severity:  normal           |   Keywords:  has-patch early
  Focuses:                   |
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 Previously discussed patches to `copy_dir()` and `_copy_dir()` to return a
 WP_Error reporting a failed directory listing. This should help with
 $51928 telemetry data.

 This was originally in #51857 patch, but extracted here as #51857 is going
 in a different direction.

 Discussed in #core
 https://wordpress.slack.com/archives/C02RQBWTW/p1611255822032100

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Ticket URL: <https://core.trac.wordpress.org/ticket/52342>
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