[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:  assigned
 Priority:  normal                     |   Milestone:  4.5
Component:  External Libraries         |     Version:  4.4
 Severity:  normal                     |  Resolution:
 Keywords:  needs-testing needs-patch  |     Focuses:  javascript
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Comment (by adamsilverstein):

 @ericlewis tracked that issue down to the binding of the click handler.
 the `listenTo` must have been getting eaten by a view refresh. Not sure
 why upgrading us/bb breaks this: this path - [attachment:34350.5.diff]  -
 fixes it by switching to `on` for binding

 Makes me thing we need to do more testing; would also love to understand
 why this broke.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34350#comment:31>
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