Update cancellation token when AllowCancellation changes

src/EditorFeatures/Core/Implementation/EncapsulateField/AbstractEncapsulateFieldCommandHandler.cs

@@ -80,6 +80,7 @@ private bool Execute(EncapsulateFieldCommandArgs args, IUIThreadOperationScope w
                 }
 
                 waitScope.AllowCancellation = false;
+                cancellationToken = waitScope.Context.UserCancellationToken;
 
                 var finalSolution = result.GetSolutionAsync(cancellationToken).WaitAndGetResult(cancellationToken);