Tableview DnD: add headers (#4307)

Author: reidbarber

packages/@react-spectrum/table/src/DragPreview.tsx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021 Adobe. All rights reserved.
+ * Copyright 2023 Adobe. All rights reserved.
  * This file is licensed to you under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License. You may obtain a copy
  * of the License at http://www.apache.org/licenses/LICENSE-2.0
@@ -9,6 +9,7 @@
  * OF ANY KIND, either express or implied. See the License for the specific language
  * governing permissions and limitations under the License.
  */
+
 import {classNames} from '@react-spectrum/utils';
 import {Direction, Node} from '@react-types/shared';
 import {Flex} from '@react-spectrum/layout';

packages/@react-spectrum/table/src/InsertionIndicator.tsx

@@ -1,3 +1,15 @@
+/*
+ * Copyright 2023 Adobe. All rights reserved.
+ * This file is licensed to you under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License. You may obtain a copy
+ * of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under
+ * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
+ * OF ANY KIND, either express or implied. See the License for the specific language
+ * governing permissions and limitations under the License.
+ */
+
 import {classNames} from '@react-spectrum/utils';
 import {FocusableElement, ItemDropTarget} from '@react-types/shared';
 import React, {DOMAttributes, HTMLAttributes, useRef} from 'react';

packages/@react-spectrum/table/src/RootDropIndicator.tsx

@@ -1,3 +1,15 @@
+/*
+ * Copyright 2023 Adobe. All rights reserved.
+ * This file is licensed to you under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License. You may obtain a copy
+ * of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under
+ * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
+ * OF ANY KIND, either express or implied. See the License for the specific language
+ * governing permissions and limitations under the License.
+ */
+
 import React, {useRef} from 'react';
 import {useTableContext} from './TableView';
 import {useVisuallyHidden} from '@react-aria/visually-hidden';