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

[WordPress Trac]

#34350: Update Backbone to 1.2.3
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 Reporter:  caseypatrickdriscoll  |       Owner:  adamsilverstein
     Type:  enhancement           |      Status:  assigned
 Priority:  normal                |   Milestone:  Future Release
Component:  External Libraries    |     Version:  4.4
 Severity:  normal                |  Resolution:
 Keywords:                        |     Focuses:  javascript
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Comment (by adamsilverstein):

 @ericlewis
 In [attachment:34350.3.diff] my only additional change is to extract
 values before flattening the array of subviews returned in
 `wp.Backbone.Subviews.add` - this fixes the slider not rendering issue:
 the ready events where never getting fired in the subviews because `all()`
 was returning an empty array.

 All the subviews are being added using a blank selector and flatten was
 returning an empty array. I'm going to test a few more things: using the
 existing versions of bb/us with this change, and tracing what happens in
 the older versions: whats changed. I'm guessing Underscore has changed how
 its `flatten` works although nothing popped out at me when reviewing the
 change logs.

 Can you test this patch to see if it resolves the issues you were seeing
 in media? subviews should now get their ready events fired which should
 help!

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Ticket URL: <https://core.trac.wordpress.org/ticket/34350#comment:10>
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