Hide insertion point if in the context it would shown it is not possi…

…ble to insert the default block

Insertion point has violating the allowedBlocks restriction of the parent block.

editor/components/block-list/insertion-point.js

@@ -73,13 +73,17 @@ class BlockInsertionPoint extends Component {
 export default compose(
 	withSelect( ( select, { uid, rootUID, canShowInserter } ) => {
 		const {
+			canInsertBlockType,
 			getBlockIndex,
 			getBlockInsertionPoint,
 			getBlock,
 			isBlockInsertionPointVisible,
 			isTyping,
 			getEditorSettings,
 		} = select( 'core/editor' );
+		const {
+			getDefaultBlockName,
+		} = select( 'core/blocks' );
 		const blockIndex = uid ? getBlockIndex( uid, rootUID ) : -1;
 		const insertIndex = blockIndex;
 		const insertionPoint = getBlockInsertionPoint();
@@ -91,14 +95,16 @@ export default compose(
 			( ! block || ! isUnmodifiedDefaultBlock( block ) )
 		);
 
+		const defaultBlockName = getDefaultBlockName();
 		return {
 			templateLock: getEditorSettings().templateLock,
 			showInserter: ! isTyping() && canShowInserter,
 			index: insertIndex,
 			showInsertionPoint,
+			canInsertDefaultBlock: canInsertBlockType( defaultBlockName, rootUID ),
 		};
 	} ),
-	ifCondition( ( { templateLock } ) => ! templateLock ),
+	ifCondition( ( { templateLock, canInsertDefaultBlock } ) => ! templateLock && canInsertDefaultBlock ),
 	withDispatch( ( dispatch ) => {
 		const { insertDefaultBlock, startTyping } = dispatch( 'core/editor' );
 		return {