[wp-trac] [WordPress Trac] #34350: Update Backbone to 1.2.3 and Underscore to 1.8.3

[WordPress Trac]

#34350: Update Backbone to 1.2.3 and Underscore to 1.8.3
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 Reporter:  caseypatrickdriscoll            |       Owner:  adamsilverstein
     Type:  enhancement                     |      Status:  reopened
 Priority:  normal                          |   Milestone:  4.5
Component:  External Libraries              |     Version:  4.4
 Severity:  normal                          |  Resolution:
 Keywords:  needs-testing has-patch commit  |     Focuses:  javascript
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Comment (by adamsilverstein):

 @ocean90 -- This fixes the theme searching issue:

 [attachment:34350.9.diff] :

 * Use an array when passing items to `union`.
 * Since Underscore 1.7.0 "For consistency, `_.union` and `_.difference`
 now only work with arrays and not variadic args."
 * Fixes an issue that prevented theme searching from working since r36546.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34350#comment:49>
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