[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 imath):

 > Delete Selected' doesn't come back to its initial state when the
 selection is emptied. I hope this "half way" patch will help you fix this
 completely

 Well actually, i've tested with previous Backbone/underscore versions and
 the  'Delete Selected' button wasn't coming back to its original state
 when the selection was emptied, so it's not a regression, it might be
 something to consider as an enhancement.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34350#comment:51>
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