Github user corneadoug commented on the issue:
https://github.com/apache/zeppelin/pull/1328
Using watchers isn't recommended, you can do it in a more simple way.
All that is needed is to do:
* `$scope.editor.setReadOnly($scope.isRunning());`
[here](https://github.com/apache/zeppelin/blob/master/zeppelin-web/src/app/notebook/paragraph/paragraph.controller.js#L2519)
and
[there](https://github.com/apache/zeppelin/blob/master/zeppelin-web/src/app/notebook/paragraph/paragraph.controller.js#L93)
* Replace the `disable` from ng-class by a new class that set `opacity: 0.6`
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