Ensure blocks locked against removal cause the Group button not to re…

…nder

packages/block-editor/src/components/convert-to-group-buttons/toolbar.js

@@ -1,7 +1,7 @@
 /**
  * WordPress dependencies
  */
-import { useDispatch } from '@wordpress/data';
+import { useDispatch, useSelect } from '@wordpress/data';
 import { switchToBlockType } from '@wordpress/blocks';
 import { ToolbarButton, ToolbarGroup } from '@wordpress/components';
 import { group } from '@wordpress/icons';
@@ -22,6 +22,16 @@ function BlockGroupToolbar( { label = __( 'Group' ) } ) {
 	} = useConvertToGroupButtonProps();
 	const { replaceBlocks } = useDispatch( blockEditorStore );
 
+	const { canRemove } = useSelect(
+		( select ) => {
+			const { canRemoveBlocks } = select( blockEditorStore );
+			return {
+				canRemove: canRemoveBlocks( clientIds ),
+			};
+		},
+		[ clientIds ]
+	);
+
 	const onConvertToGroup = () => {
 		const newBlocks = switchToBlockType(
 			blocksSelection,
@@ -35,7 +45,8 @@ function BlockGroupToolbar( { label = __( 'Group' ) } ) {
 	// Don't render the button if the current selection cannot be grouped.
 	// A good example is selecting multiple button blocks within a Buttons block:
 	// The group block is not a valid child of Buttons, so we should not show the button.
-	if ( ! isGroupable ) {
+	// Any blocks that are locked against removal also cannot be grouped.
+	if ( ! isGroupable || ! canRemove ) {
 		return null;
 	}