[wp-trac] [WordPress Trac] #36618: Move WP_Upgrader and WP_Upgrader_Skin subclasses into separate files

[WordPress Trac]

#36618: Move WP_Upgrader and WP_Upgrader_Skin subclasses into separate files
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 Reporter:  ocean90          |       Owner:  ocean90
     Type:  enhancement      |      Status:  assigned
 Priority:  normal           |   Milestone:  4.6
Component:  Upgrade/Install  |     Version:
 Severity:  normal           |  Resolution:
 Keywords:  early            |     Focuses:
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Comment (by ocean90):

 Replying to [comment:10 ocean90]:
 > 8) Check references to include/require `wp-admin/includes/class-wp-
 upgrader.php` and if they can be changed to include/require only necessary
 files. `File_Upload_Upgrader` might to be one of those.

 `File_Upload_Upgrader` is only used in `/wp-admin/update.php` which has an
 `include_once` for `class-wp-upgrader.php` on top. `WP_Automatic_Updater`
 is another class which is not a subclass of `WP_Upgrader` but it's using
 skins and other upgraders.
 For now, we have to continue loading `wp-admin/includes/class-wp-
 upgrader.php` until we have an autoloader, see #36335.

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Ticket URL: <https://core.trac.wordpress.org/ticket/36618#comment:18>
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