angular-ui-tree: JavaScript runtime error: Object doesn't support property or method 'contains'

gistfile1.txt

// There's an issue in ui-tree:
// - https://github.com/angular-ui-tree/angular-ui-tree/issues/318
// Waiting for Pull Request to be merged:
// - https://github.com/angular-ui-tree/angular-ui-tree/pull/648
// Issue type is very similar to this in angular.js:
// - https://github.com/angular/angular.js/issues/10259
// Function aliasing: http://stackoverflow.com/a/1007433/1023664
// Recommendation: Update angular-ui-tree after the pull request is merged

if(typeof document.contains === "undefined") {
  document.contains = function() {
    return document.body.contains.apply(document.body, arguments);
  }
}