fix: add overContainer property to dragOutEvent

Author: zjffun

src/Draggable/Draggable.js

@@ -477,6 +477,7 @@ export default class Draggable {
         sourceContainer: container,
         sensorEvent,
         over: this.currentOver,
+        overContainer: this.currentOverContainer,
       });
 
       this.currentOver.classList.remove(this.getClassNameFor('draggable:over'));

src/Draggable/tests/Draggable.test.js

@@ -927,4 +927,29 @@ describe('Draggable', () => {
       releaseMouse(newInstance.source);
     });
   });
+
+  describe('when `drag:out`', () => {
+    it('should trigger dragOutEvent', () => {
+      const newInstance = new Draggable(containers, {
+        draggable: 'li',
+      });
+      const draggableElement = sandbox.querySelector('li');
+      document.elementFromPoint = () => draggableElement;
+
+      newInstance.on('drag:out', (event) => {
+        expect(event.overContainer).toBe(containers[0]);
+      });
+
+      clickMouse(draggableElement);
+
+      waitForDragDelay();
+
+      document.elementFromPoint = () => draggableElement.nextElementSibling;
+      moveMouse(draggableElement.nextElementSibling);
+
+      waitForDragDelay();
+
+      releaseMouse(newInstance.source);
+    });
+  });
 });