[wp-trac] [WordPress Trac] #15221: Add custom upgrade action to update-core.php

[WordPress Trac]

#15221: Add custom upgrade action to update-core.php
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 Reporter:  ampt          |       Owner:                 
     Type:  defect (bug)  |      Status:  new            
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  General       |     Version:                 
 Severity:  normal        |    Keywords:                 
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 Allow plugins to hook into /wp-admin/update-core.php. This also fixes
 #14456.

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Ticket URL: <http://core.trac.wordpress.org/ticket/15221>
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