Media: Restore keyboard navigation of the media grid.

This changes the binding of event listeners in the Attachments Browser
to use `on` instead of `listenTo` for the `attachment:keydown:arrow` and
`attachment:details:shift-tab` events. The existing listeners broke
when we upgraded Backbone in [36546].

Props adamsilverstein.
Fixes #36900.
Built from https://develop.svn.wordpress.org/trunk@37755


git-svn-id: http://core.svn.wordpress.org/trunk@37720 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/media-views.js

@@ -4085,8 +4085,8 @@ AttachmentsBrowser = View.extend({
 		});
 
 		// Add keydown listener to the instance of the Attachments view
-		this.attachments.listenTo( this.controller, 'attachment:keydown:arrow',     this.attachments.arrowEvent );
-		this.attachments.listenTo( this.controller, 'attachment:details:shift-tab', this.attachments.restoreFocus );
+		this.controller.on( 'attachment:keydown:arrow',     _.bind( this.attachments.arrowEvent, this.attachments ) );
+		this.controller.on( 'attachment:details:shift-tab', _.bind( this.attachments.restoreFocus, this.attachments ) );
 
 		this.views.add( this.attachments );
 

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-alpha-37753';
+$wp_version = '4.6-alpha-37755';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.