[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):

 @adamsilverstein i've found another issue with the Media Library Bulk
 button. It was no longer showing the 'Delete Selected' & 'Cancel
 Selection' buttons.
 34350.10.patch is bringing back the buttons and it's possible to bulk
 delete, but the '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.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34350#comment:50>
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