7011443: ./share/classes/sun/awt/SunToolkit.java needs to avoid spurious wakeup

Reviewed-by: anthony

src/share/classes/sun/awt/SunToolkit.java

@@ -696,8 +696,10 @@ public abstract class SunToolkit extends Toolkit
 
         synchronized (lock) {
             executeOnEventHandlerThread(event);
+            while(!event.isDispatched()) {
                 lock.wait();
             }
+        }
 
         Throwable eventThrowable = event.getThrowable();
         if (eventThrowable != null) {