fix: Update Tree drag and drop focus

packages/@react-aria/dnd/src/useDroppableCollection.ts

@@ -14,6 +14,7 @@ import {
   clearGlobalDnDState,
   DIRECTORY_DRAG_TYPE,
   droppableCollectionMap,
+  getItemElement,
   getTypes,
   globalDndState,
   isInternalDropOperation,
@@ -273,6 +274,25 @@ export function useDroppableCollection(props: DroppableCollectionOptions, state:
               first = item.parentKey;
             }
 
+            if (item?.type === 'content') {
+              let parentKey = item.parentKey;
+              while (parentKey) {
+                let parent = state.collection.getItem(parentKey);
+                if (parent?.type !== 'item') {
+                  parentKey = parent?.parentKey;
+                  continue;
+                }
+                // If an item doesn't exist in the collection,
+                // it's because its parent is collapsed, and we should focus its parent instead.
+                let item = getItemElement(ref, parentKey);
+                if (item) {
+                  first = parentKey;
+                  break;
+                }
+                parentKey = parent.parentKey;
+              }
+            }
+
             // eslint-disable-next-line max-depth
             if (first != null) {
               state.selectionManager.setFocusedKey(first);
@@ -312,7 +332,7 @@ export function useDroppableCollection(props: DroppableCollectionOptions, state:
 
       state.selectionManager.setFocused(true);
     }
-  }, [localState]);
+  }, [localState, ref]);
 
   let onDrop = useCallback((e: DropEvent, target: DropTarget) => {
     let {state} = localState;

packages/@react-aria/dnd/src/utils.ts

@@ -383,3 +383,12 @@ export let globalAllowedDropOperations: DROP_OPERATION = DROP_OPERATION.none;
 export function setGlobalAllowedDropOperations(o: DROP_OPERATION): void {
   globalAllowedDropOperations = o;
 }
+
+export function getItemElement(collectionRef: RefObject<HTMLElement | null>, key: Key): Element | null | undefined {
+  let selector = `[data-key="${CSS.escape(String(key))}"]`;
+  let collection = collectionRef.current?.dataset.collection;
+  if (collection) {
+    selector = `[data-collection="${CSS.escape(collection)}"]${selector}`;
+  }
+  return collectionRef.current?.querySelector(selector);
+}

packages/react-aria-components/test/Tree.test.tsx

@@ -24,7 +24,8 @@ import {useTreeData} from 'react-stately';
 
 let {
   EmptyTreeStaticStory: EmptyLoadingTree,
-  LoadingStoryDepOnTopStory: LoadingMoreTree
+  LoadingStoryDepOnTopStory: LoadingMoreTree,
+  TreeWithDragAndDrop
 } = composeStories(stories);
 
 let onSelectionChange = jest.fn();
@@ -1924,6 +1925,60 @@ describe('Tree', () => {
       expect(onRootDrop).toHaveBeenCalledTimes(1);
     });
 
+    it('should automatically focus the newly added dropped item', async () => {
+      const {getAllByRole} = render(<TreeWithDragAndDrop />);
+
+      const trees = getAllByRole('treegrid');
+      const firstTreeRows = within(trees[0]).getAllByRole('row');
+      const dataTransfer = new DataTransfer();
+
+      fireEvent(firstTreeRows[1], new DragEvent('dragstart', {dataTransfer, clientX: 5, clientY: 5}));
+      act(() => jest.runAllTimers());
+
+      fireEvent(trees[1], new DragEvent('dragenter', {dataTransfer, clientX: 50, clientY: 50}));
+      fireEvent(trees[1], new DragEvent('dragover', {dataTransfer, clientX: 50, clientY: 50}));
+      expect(trees[1]).toHaveAttribute('data-drop-target', 'true');
+
+      // ¯\_(ツ)_/¯
+      await act(async () => fireEvent(trees[1], new DragEvent('drop', {dataTransfer, clientX: 50, clientY: 50})));
+      act(() => jest.runAllTimers());
+
+      let secondTreeRows = within(trees[1]).getAllByRole('row');
+
+      expect(secondTreeRows).toHaveLength(1);
+      // The newly added row in the second tree should be the active element
+      expect(secondTreeRows[0]).toBe(document.activeElement);
+
+      await user.click(document.body);
+      act(() => jest.runAllTimers());
+
+      await user.tab();
+      await user.keyboard('{ArrowRight}'); // expand the projects item
+      await user.keyboard('{ArrowRight}');
+      await user.keyboard('{Enter}');
+      act(() => jest.runAllTimers());
+
+      await user.tab();
+      act(() => jest.runAllTimers());
+
+      secondTreeRows = within(trees[1]).getAllByRole('row');
+      expect(secondTreeRows).toHaveLength(4);
+      expect(within(secondTreeRows[3]).getAllByRole('button')[0]).toHaveAttribute('aria-label', 'Insert after Reports');
+      expect(document.activeElement).toBe(within(secondTreeRows[3]).getAllByRole('button')[0]);
+      expect(secondTreeRows[3]).toHaveAttribute('data-drop-target', 'true');
+
+      await user.keyboard('{ArrowUp}');
+      expect(within(secondTreeRows[2]).getAllByRole('button')[0]).toHaveAttribute('aria-label', 'Drop on Reports');
+      expect(document.activeElement).toBe(within(secondTreeRows[2]).getAllByRole('button')[0]);
+
+      await user.keyboard('{Enter}');
+      act(() => jest.runAllTimers());
+
+      secondTreeRows = within(trees[1]).getAllByRole('row');
+      expect(secondTreeRows).toHaveLength(1);
+      expect(secondTreeRows[0]).toBe(document.activeElement);
+    });
+
     it('should support disabled drag and drop', async () => {
       let {getByRole, queryAllByRole} = render(
         <DraggableTree isDisabled />