[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 swissspidy):

 @ocean90 Attention! [37411] broke update functionality in core.

 There's a `$package = '';` line in `WP_Upgrader::download_package()`,
 probably a leftover from debugging.

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Ticket URL: <https://core.trac.wordpress.org/ticket/36618#comment:20>
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