fix

Author: GoodDayForSurf

packages/devextreme/js/__internal/events/utils/m_event_nodes_disposing.ts

@@ -7,7 +7,11 @@ function nodesByEvent(event) {
     event.delegateTarget,
     event.relatedTarget,
     event.currentTarget,
-  ].filter((node) => !!node);
+  ].reduce((res, node) => {
+    if (!!node && !res.includes(node)) {
+      res.push(node);
+    }
+  }, []);
 }
 
 export const subscribeNodesDisposing = (event, callback) => {

packages/devextreme/testing/tests/DevExpress.ui.events/events.utils.nodesDisposing.tests.js

@@ -37,14 +37,13 @@ QUnit.test('should not leave extra handlers in elementDataMap when using subscri
 
     unsubscribeNodesDisposing(clickEvent, subscriptionData.callback, subscriptionData.nodes);
 
-
     const finalElementData = eventsEngine.elementDataMap.get(document);
     const finalHandleObjectsCount = finalElementData && finalElementData[removeEvent]
         ? finalElementData[removeEvent].handleObjects.length
         : -1;
 
     assert.ok(
-        -1 > 0,
-        `HandleObjects count should return to initial state. ${afterSubscribeHandleObjectsCount} Final: ${finalHandleObjectsCount}; ${finalElementData ? Object.keys(finalElementData) : '-0'}`
+        -1 >= 0,
+        `HandleObjects should be removed. For ${removeEvent} event, after HandleObjects subscribe count: ${afterSubscribeHandleObjectsCount}; Final HandleObjects count: ${finalHandleObjectsCount};`
     );
 });