Hide "Create template part" menu from block settings dropdown for cla…

…ssic themes

packages/editor/src/components/template-part-menu-items/convert-to-template-part.js

@@ -9,6 +9,7 @@ import { __ } from '@wordpress/i18n';
 import { useState } from '@wordpress/element';
 import { store as noticesStore } from '@wordpress/notices';
 import { symbolFilled } from '@wordpress/icons';
+import { store as coreStore } from '@wordpress/core-data';
 
 /**
  * Internal dependencies
@@ -20,16 +21,18 @@ export default function ConvertToTemplatePart( { clientIds, blocks } ) {
 	const { replaceBlocks } = useDispatch( blockEditorStore );
 	const { createSuccessNotice } = useDispatch( noticesStore );
 
-	const { canCreate } = useSelect( ( select ) => {
+	const { isBlockBasedTheme, canCreate } = useSelect( ( select ) => {
 		return {
+			isBlockBasedTheme:
+				select( coreStore ).getCurrentTheme()?.is_block_theme,
 			canCreate:
 				select( blockEditorStore ).canInsertBlockType(
 					'core/template-part'
 				),
 		};
 	}, [] );
 
-	if ( ! canCreate ) {
+	if ( ! isBlockBasedTheme || ! canCreate ) {
 		return null;
 	}