Rich Text: Remove restoreContentAndSplit

Call `onSplit` directly

editor/components/rich-text/index.js

@@ -541,7 +541,7 @@ export class RichText extends Component {
 				const before = domToFormat( beforeNodes, format, this.editor );
 				const after = domToFormat( afterNodes, format, this.editor );
 
-				this.restoreContentAndSplit( before, after );
+				this.props.onSplit( before, after );
 			} else {
 				event.preventDefault();
 
@@ -661,7 +661,7 @@ export class RichText extends Component {
 			after = this.isEmpty( after ) ? null : after;
 		}
 
-		this.restoreContentAndSplit( before, after, blocks );
+		onSplit( before, after, ...blocks );
 	}
 
 	onNodeChange( { parents } ) {
@@ -823,19 +823,6 @@ export class RichText extends Component {
 		} ) );
 	}
 
-	/**
-	 * Calling onSplit means we need to abort the change done by TinyMCE.
-	 * we need to call updateContent to restore the initial content before calling onSplit.
-	 *
-	 * @param {Array}  before content before the split position
-	 * @param {Array}  after  content after the split position
-	 * @param {?Array} blocks blocks to insert at the split position
-	 */
-	restoreContentAndSplit( before, after, blocks = [] ) {
-		this.setContent( this.props.value );
-		this.props.onSplit( before, after, ...blocks );
-	}
-
 	render() {
 		const {
 			tagName: Tagname = 'div',