Select Mode: Prevent the inbetween inserter from triggering within se…

…ctions (WordPress#65529)

Co-authored-by: youknowriad <youknowriad@git.wordpress.org>
Co-authored-by: mikachan <mikachan@git.wordpress.org>
Co-authored-by: jameskoster <jameskoster@git.wordpress.org>

packages/block-editor/src/components/block-list/use-in-between-inserter.js

@@ -11,6 +11,7 @@ import { isRTL } from '@wordpress/i18n';
  */
 import { store as blockEditorStore } from '../../store';
 import { InsertionPointOpenRef } from '../block-tools/insertion-point';
+import { unlock } from '../../lock-unlock';
 
 export function useInBetweenInserter() {
 	const openRef = useContext( InsertionPointOpenRef );
@@ -31,7 +32,8 @@ export function useInBetweenInserter() {
 		getBlockEditingMode,
 		getBlockName,
 		getBlockAttributes,
-	} = useSelect( blockEditorStore );
+		getParentSectionBlock,
+	} = unlock( useSelect( blockEditorStore ) );
 	const { showInsertionPoint, hideInsertionPoint } =
 		useDispatch( blockEditorStore );
 
@@ -133,7 +135,8 @@ export function useInBetweenInserter() {
 				const clientId = element.id.slice( 'block-'.length );
 				if (
 					! clientId ||
-					__unstableIsWithinBlockOverlay( clientId )
+					__unstableIsWithinBlockOverlay( clientId ) ||
+					!! getParentSectionBlock( clientId )
 				) {
 					return;
 				}