show definitions: cancel update after success

platform/lang-impl/src/com/intellij/codeInsight/hint/actions/ShowImplementationsAction.java

@@ -354,7 +354,7 @@ public class ShowImplementationsAction extends AnAction implements PopupAction {
 
     @Override
     public void onSuccess() {
-      if (!isCanceled()) {
+      if (!setCanceled()) {
         myComponent.update(myElements, myComponent.getIndex());
       }
       super.onSuccess();

platform/lang-impl/src/com/intellij/codeInsight/navigation/BackgroundUpdaterTask.java

@@ -78,12 +78,10 @@ public abstract class BackgroundUpdaterTask<T> extends Task.Backgroundable {
   protected abstract void replaceModel(List<PsiElement> data);
   protected abstract void paintBusy(boolean paintBusy);
 
-  public void setCanceled() {
+  public boolean setCanceled() {
+    boolean canceled = myCanceled;
     myCanceled = true;
-  }
-
-  public boolean isCanceled() {
-    return myCanceled;
+    return canceled;
   }
 
   public void updateComponent(PsiElement element, @Nullable final Comparator comparator) {