Issue 22157. Cancel a pending refactoring request on receiving a new one.

pkg/analysis_server/test/integration/integration_test_methods.dart

Index: pkg/analysis_server/test/integration/integration_test_methods.dart
diff --git a/pkg/analysis_server/test/integration/integration_test_methods.dart b/pkg/analysis_server/test/integration/integration_test_methods.dart
index 2158ed6d9fec2be709c10092948e4345e92acb81..1947dfce7406c63dae8705b037d53e9b504d72a5 100644
--- a/pkg/analysis_server/test/integration/integration_test_methods.dart
+++ b/pkg/analysis_server/test/integration/integration_test_methods.dart
@@ -1182,6 +1182,9 @@ abstract class IntegrationTestMixin {
   /**
    * Get the changes required to perform a refactoring.
    *
+   * If another refactoring request is received during the processing of this
+   * one, an error of type REFACTORING_REQUEST_CANCELLED will be generated.
+   *
    * Parameters
    *
    * kind ( RefactoringKind )