[RNMobile] Correct post title focus (#23683)

packages/editor/src/components/post-title/index.native.js

@@ -26,13 +26,21 @@ import { pasteHandler } from '@wordpress/blocks';
 import styles from './style.scss';
 
 class PostTitle extends Component {
+	constructor( props ) {
+		super( props );
+
+		this.setRef = this.setRef.bind( this );
+	}
 	componentDidUpdate( prevProps ) {
-		// Unselect if any other block is selected
+		// Unselect if any other block is selected and blur the RichText
 		if (
 			this.props.isSelected &&
 			! prevProps.isAnyBlockSelected &&
 			this.props.isAnyBlockSelected
 		) {
+			if ( this.richTextRef ) {
+				this.richTextRef.blur();
+			}
 			this.props.onUnselect();
 		}
 	}
@@ -64,6 +72,10 @@ class PostTitle extends Component {
 		}
 	}
 
+	setRef( richText ) {
+		this.richTextRef = richText;
+	}
+
 	render() {
 		const {
 			placeholder,
@@ -100,6 +112,7 @@ class PostTitle extends Component {
 				}
 			>
 				<RichText
+					setRef={ this.setRef }
 					tagName={ 'p' }
 					tagsToEliminate={ [ 'strong' ] }
 					unstableOnFocus={ this.props.onSelect }