Create the proper shortcode on paste (#21864)

packages/block-editor/src/components/rich-text/index.js

@@ -39,6 +39,7 @@ import {
 } from '@wordpress/rich-text';
 import deprecated from '@wordpress/deprecated';
 import { isURL } from '@wordpress/url';
+import { regexp } from '@wordpress/shortcode';
 
 /**
  * Internal dependencies
@@ -93,6 +94,8 @@ function getAllowedFormats( {
 
 getAllowedFormats.EMPTY_ARRAY = [];
 
+const isShortcode = ( text ) => regexp( '.*' ).test( text );
+
 function RichTextWrapper(
 	{
 		children,
@@ -400,6 +403,18 @@ function RichTextWrapper(
 
 			let mode = onReplace && onSplit ? 'AUTO' : 'INLINE';
 
+			// Force the blocks mode when the user is pasting
+			// on a new line & the content resembles a shortcode.
+			// Otherwise it's going to be detected as inline
+			// and the shortcode won't be replaced.
+			if (
+				mode === 'AUTO' &&
+				isEmpty( value ) &&
+				isShortcode( plainText )
+			) {
+				mode = 'BLOCKS';
+			}
+
 			if (
 				__unstableEmbedURLOnPaste &&
 				isEmpty( value ) &&