java/awt/Debug/DumpOnKey/DumpOnKey.java times out on Windows

java/awt/Debug/DumpOnKey/DumpOnKey.java often times out on windows.
The test is invoked 8 times with different arguments and it is not
always the same parameter combination that times out.
And the stack trace from jtreg shows it waiting for idle after
a key press .. but different key press invocations for different hangs :
One at line 70 and another at line 72
----
"MainThread" #14 prio=5 os_prio=0 tid=0x0000000030b37800 nid=0x1954 in Object.wait() [0x00000000333ce000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(java.base@11-internal/Native Method)
- waiting on <0x000000074bc8f418> (a java.lang.Object)
at java.lang.Object.wait(java.base@11-internal/Object.java:328)
at sun.awt.SunToolkit.waitForIdle(java.desktop@11-internal/SunToolkit.java:1565)
- waiting to re-lock in wait() <0x000000074bc8f418> (a java.lang.Object)
at sun.awt.SunToolkit.realSync(java.desktop@11-internal/SunToolkit.java:1500)
at sun.awt.SunToolkit.realSync(java.desktop@11-internal/SunToolkit.java:1402)
at java.awt.Robot.waitForIdle(java.desktop@11-internal/Robot.java:692)
- locked <0x000000074b9fbc88> (a java.awt.Robot)
at java.awt.Robot.autoWaitForIdle(java.desktop@11-internal/Robot.java:628)
at java.awt.Robot.afterEvent(java.desktop@11-internal/Robot.java:601)
at java.awt.Robot.keyPress(java.desktop@11-internal/Robot.java:358)
- locked <0x000000074b9fbc88> (a java.awt.Robot)
at DumpOnKey.main(DumpOnKey.java:70)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(java.base@11-internal/Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(java.base@11-internal/NativeMethodAccessorImpl.java:62)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(java.base@11-internal/DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(java.base@11-internal/Method.java:569)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:115)
at java.lang.Thread.run(java.base@11-internal/Thread.java:832)

=================


"MainThread" #14 prio=5 os_prio=0 tid=0x0000000030625800 nid=0xb7c in Object.wait() [0x00000000322ae000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(java.base@11-internal/Native Method)
- waiting on <0x000000074bc108a8> (a java.lang.Object)
at java.lang.Object.wait(java.base@11-internal/Object.java:328)
at sun.awt.SunToolkit.waitForIdle(java.desktop@11-internal/SunToolkit.java:1565)
- waiting to re-lock in wait() <0x000000074bc108a8> (a java.lang.Object)
at sun.awt.SunToolkit.realSync(java.desktop@11-internal/SunToolkit.java:1489)
at sun.awt.SunToolkit.realSync(java.desktop@11-internal/SunToolkit.java:1402)
at java.awt.Robot.waitForIdle(java.desktop@11-internal/Robot.java:692)
- locked <0x000000074b9d3410> (a java.awt.Robot)
at java.awt.Robot.autoWaitForIdle(java.desktop@11-internal/Robot.java:628)
at java.awt.Robot.afterEvent(java.desktop@11-internal/Robot.java:601)
at java.awt.Robot.keyPress(java.desktop@11-internal/Robot.java:358)
- locked <0x000000074b9d3410> (a java.awt.Robot)
at DumpOnKey.main(DumpOnKey.java:72)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(java.base@11-internal/Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(java.base@11-internal/NativeMethodAccessorImpl.java:62)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(java.base@11-internal/DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(java.base@11-internal/Method.java:569)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:115)
at java.lang.Thread.run(java.base@11-internal/Thread.java:832)