[wp-trac] [WordPress Trac] #47478: Update Backbone.js to 1.4.0

[WordPress Trac]

#47478: Update Backbone.js to 1.4.0
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 Reporter:  desrosj                              |       Owner:
                                                 |  priyankkpatel
     Type:  task (blessed)                       |      Status:  assigned
 Priority:  normal                               |   Milestone:  5.3
Component:  External Libraries                   |     Version:
 Severity:  normal                               |  Resolution:
 Keywords:  early good-first-bug has-patch       |     Focuses:
  needs-testing needs-refresh                    |
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Comment (by desrosj):

 I did some testing with this today. I found a few issues. They all seem to
 be related to `this._listeners` and cleaning up memory bindings. Here are
 scenarios that are showing the issue:

 1. Go to the Media Library and upload an image. When uploading finishes,
 you'll see the console error.
 2. In the Classic Editor, click Add Media, select an image, click insert.
 Observe the console error.
 3. In the Classic Editor, click Add Media, click Create Gallery. Observe
 the console error. The view also does not switch, and subsequent tab
 changes do not always work. Clicking Create New Gallery does nothing.

 These issues also happen when working with the media modals in the block
 editor.

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Ticket URL: <https://core.trac.wordpress.org/ticket/47478#comment:6>
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