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When one creates a new file and adds the ng-app directive or any other angular directive and the file doesn't refer the angular.js library, show a hint + hitfix which adds the <script src="path_to_angular.js"></script> element. The angular library can be searched in the project classpath or downloaded if not found.
Please consider the data-ng-* attributes as well. (I use data-ng-app vs. ng-app for example to avoid HTML5 warnings.)
Yes, by ng-app, I simply meant the "app" directive regardless the notation.