Internal: Changed the way of getting initial data from element.

src/ballooneditor.js

@@ -13,6 +13,7 @@ import BalloonToolbar from '@ckeditor/ckeditor5-ui/src/toolbar/balloon/balloonto
 import BalloonEditorUI from './ballooneditorui';
 import BalloonEditorUIView from './ballooneditoruiview';
 import setDataInElement from '@ckeditor/ckeditor5-utils/src/dom/setdatainelement';
+import getDataFromElement from '@ckeditor/ckeditor5-utils/src/dom/getdatafromelement';
 import DataApiMixin from '@ckeditor/ckeditor5-core/src/editor/utils/dataapimixin';
 import ElementApiMixin from '@ckeditor/ckeditor5-core/src/editor/utils/elementapimixin';
 import attachToForm from '@ckeditor/ckeditor5-core/src/editor/utils/attachtoform';
@@ -142,7 +143,7 @@ export default class BalloonEditor extends Editor {
 						editor.ui.init();
 						editor.fire( 'uiReady' );
 					} )
-					.then( () => editor.loadDataFromElement() )
+					.then( () => editor.data.init( getDataFromElement( element ) ) )
 					.then( () => {
 						editor.fire( 'dataReady' );
 						editor.fire( 'ready' );