fixes in test code following IDEA-CR-19015

java/java-tests/testSrc/com/intellij/codeInsight/completion/CompletionHintsTest.java

@@ -25,6 +25,7 @@ import com.intellij.openapi.util.registry.RegistryValue;
 import com.intellij.util.ui.UIUtil;
 
 import java.util.concurrent.TimeUnit;
+import java.util.concurrent.locks.LockSupport;
 import java.util.stream.Stream;
 
 public class CompletionHintsTest extends LightFixtureCompletionTestCase {
@@ -124,6 +125,7 @@ public class CompletionHintsTest extends LightFixtureCompletionTestCase {
     long deadline = System.currentTimeMillis() + 60_000;
     while (ParameterHintsPresentationManager.getInstance().isAnimationInProgress(getEditor())) {
       if (System.currentTimeMillis() > deadline) fail("Too long waiting for animation to finish");
+      LockSupport.parkNanos(10_000_000);
       UIUtil.dispatchAllInvocationEvents();
     }
   }

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

@@ -61,6 +61,7 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
+import java.util.concurrent.locks.LockSupport;
 
 public class ParameterInfoController implements Disposable {
   private final Project myProject;
@@ -431,14 +432,18 @@ public class ParameterInfoController implements Disposable {
           break;
         }
       }
-      if (hasPendingRequests) UIUtil.dispatchAllInvocationEvents();
+      if (hasPendingRequests) {
+        LockSupport.parkNanos(10_000_000);
+        UIUtil.dispatchAllInvocationEvents();
+      }
       else return;
+
     }
     throw new TimeoutException();
   }
 
   /**
-   * @return Point in layered pane coordinate system
+   * Returned Point is in layered pane coordinate system.
    */
   static Pair<Point, Short> chooseBestHintPosition(Project project,
                                                    Editor editor,