Dominik Schilling 6f2a56bf3e Themes: After [36546] restore theme search functionality. ...

* Correct several incorrect uses of `_.union`. Since Underscore 1.7.0 `_.union` supports only arrays and not variadic args.
* Use a namespaced event `themes:update`. Backbone 1.2 added a built in `update` event that triggers after any amount of models are added or removed from a collection.

Props adamsilverstein.
See #34350.
Built from https://develop.svn.wordpress.org/trunk@36580


git-svn-id: http://core.svn.wordpress.org/trunk@36547 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2016-02-18 21:21:26 +00:00

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