Post Template: Update template title selector (#42091)

* Post Template: Update template title selector

* Check available template first

* Use availableTemplates when theme doesn't support block templates

packages/edit-post/src/components/sidebar/post-template/index.js

@@ -12,6 +12,7 @@ import { store as coreStore } from '@wordpress/core-data';
  * Internal dependencies
  */
 import PostTemplateForm from './form';
+import { store as editPostStore } from '../../../store';
 
 export default function PostTemplate() {
 	const anchorRef = useRef();
@@ -72,16 +73,14 @@ function PostTemplateToggle( { isOpen, onClick } ) {
 		const templateSlug =
 			select( editorStore ).getEditedPostAttribute( 'template' );
 
-		const settings = select( editorStore ).getEditorSettings();
-		if ( settings.availableTemplates[ templateSlug ] ) {
-			return settings.availableTemplates[ templateSlug ];
+		const { supportsTemplateMode, availableTemplates } =
+			select( editorStore ).getEditorSettings();
+		if ( ! supportsTemplateMode && availableTemplates[ templateSlug ] ) {
+			return availableTemplates[ templateSlug ];
 		}
 
-		const template = select( coreStore )
-			.getEntityRecords( 'postType', 'wp_template', { per_page: -1 } )
-			?.find( ( { slug } ) => slug === templateSlug );
-
-		return template?.title.rendered;
+		const template = select( editPostStore ).getEditedPostTemplate();
+		return template?.title ?? template?.slug;
 	}, [] );
 
 	return (