[wp-trac] [WordPress Trac] #58995: Remove individual files from `$_old_files` array when its parent directory is already included

[WordPress Trac]

#58995: Remove individual files from `$_old_files` array when its parent directory
is already included
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 Reporter:  davidbaumwald             |       Owner:  (none)
     Type:  defect (bug)              |      Status:  new
 Priority:  normal                    |   Milestone:  6.4
Component:  Upgrade/Install           |     Version:  6.3
 Severity:  normal                    |  Resolution:
 Keywords:  good-first-bug has-patch  |     Focuses:
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Comment (by pbiron):

 @davidbaumwald the PR LGTM, but it wouldn't hurt to have another set of
 eyes on it.

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Ticket URL: <https://core.trac.wordpress.org/ticket/58995#comment:8>
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