With the changes in PR 18843 the `AnnotationEditorUIManager.prototype.updateMode` method is now asynchronous, which we need to take into account when dispatching the "annotationeditormodechanged" event.
With the changes in PR 18843 the `AnnotationEditorUIManager.prototype.updateMode` method is now asynchronous, which we need to take into account when dispatching the "annotationeditormodechanged" event.