making sure to have the RecyclerView update and re-draw the elements …

…in viewport when onChange

src/block-management/block-manager.js

@@ -117,6 +117,7 @@ export default class BlockManager extends React.Component<PropsType, StateType>
 		const dataSource = this.state.dataSource;
 		const block = dataSource.get( index );
 		block.attributes = attributes;
+		dataSource.set( index, block );
 		// Update Redux store
 		this.props.onChange( clientId, attributes );
 	}