[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
-------------------------------------+------------------------------
 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 has-patch  |     Focuses:  javascript
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Comment (by ericlewis):

 In [changeset:"36305"]:
 {{{
 #!CommitTicketReference repository="" revision="36305"
 In wp.Backbone.Subviews, extract subviews with proper Underscore.js
 functions.

 Subviews are stored internally on the Subview manager as an object. The
 object
 is composed of key-value pairs where the key is a jQuery selector for a
 view,
 and the value is an array of views that matching the selector.

 To extract subviews, `_.flatten()` was used to collate the nested arrays
 of
 views into a single view. However, `_.flatten()` is not intended to be
 used
 for objects, and this unintended functionality breaks in newer versions of
 Underscore.js.

 Instead, we'll use `_.values()` to extract the arrays of views first,
 and then flatten the array of arrays.

 Props adamsilverstein.
 See #34350.
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/34350#comment:17>
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