fix by Copilot review

Author: dmlvr

packages/devextreme/js/__internal/grids/tree_list/data_source_adapter/m_data_source_adapter.test.ts

@@ -108,6 +108,7 @@ describe('TreeList DataSourceAdapter - T1311885 Race Condition', () => {
     (dataSourceAdapter as any)._cachedStoreData = parentData;
     (dataSourceAdapter as any)._dataSource = {
       store: jest.fn(() => mockStore),
+      cancel: jest.fn(),
     };
     (dataSourceAdapter as any)._lastOperationId = OPERATION_ID.FIRST;
 

packages/devextreme/js/__internal/grids/tree_list/data_source_adapter/m_data_source_adapter.ts

@@ -17,6 +17,7 @@ import treeListCore from '../m_core';
 const { queryByOptions } = storeHelper;
 
 const DEFAULT_KEY_EXPRESSION = 'id';
+const ERROR_MESSAGE = 'Operation cancelled due to operationId mismatch (possible race condition)';
 
 const isFullBranchFilterMode = (that) => that.option('filterMode') === 'fullBranch';
 
@@ -381,10 +382,10 @@ export class DataSourceAdapterTreeList extends DataSourceAdapter {
     if (options.operationId !== undefined
       && this._lastOperationId !== undefined
       && options.operationId !== this._lastOperationId) {
-      this._dataSource.close(options.operationId); // Cancel the request
+      this._dataSource.cancel(options.operationId); // Cancel the request
       // @ts-expect-error
       const rejectedDeferred = new Deferred();
-      rejectedDeferred.reject();
+      rejectedDeferred.reject(new Error(ERROR_MESSAGE));
       return rejectedDeferred; // Return rejected Deferred
     }
 
@@ -448,6 +449,7 @@ export class DataSourceAdapterTreeList extends DataSourceAdapter {
       if (options.operationId !== undefined
         && this._lastOperationId !== undefined
         && options.operationId !== this._lastOperationId) {
+        d.reject();
         return; // Ignore outdated result
       }