Block Editor: Restore ToolSelector component for backward compatibility

packages/block-editor/README.md

@@ -847,6 +847,10 @@ _Related_
 
 -   <https://github.com/WordPress/gutenberg/blob/HEAD/packages/data/README.md#registerStore>
 
+### ToolSelector
+
+This component has been deprecated and no longer renders anything.
+
 ### transformStyles
 
 Applies a series of CSS rule transforms to wrap selectors inside a given class and/or rewrite URLs depending on the parameters passed.

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

@@ -172,3 +172,7 @@ export { useBlockEditingMode } from './block-editing-mode';
 export { default as BlockEditorProvider } from './provider';
 export { useSettings, useSetting } from './use-settings';
 export { useBlockCommands } from './use-block-commands';
+
+// This component is no longer used in Gutenberg,
+// but kept for backwards compatibility.
+export { default as ToolSelector } from './tool-selector';

packages/block-editor/src/components/tool-selector/index.js

@@ -0,0 +1,19 @@
+/**
+ * WordPress dependencies
+ */
+import deprecated from '@wordpress/deprecated';
+import { forwardRef } from '@wordpress/element';
+
+function ToolSelector() {
+	deprecated( 'wp.blockEditor.ToolSelector', {
+		since: '6.9',
+		hint: 'The ToolSelector component no longer renders anything.',
+	} );
+
+	return null;
+}
+
+/**
+ * This component has been deprecated and no longer renders anything.
+ */
+export default forwardRef( ToolSelector );