GLCanvas paint get stuck after some idle time.

While using jcef to display a chart. After some idle time the frame got stuck. The thread dump shows blow. It's that a bug  
of JCEF or jogl?
```
"AWT-EventQueue-0" #18 prio=6 os_prio=0 tid=0x00000000200a0800 nid=0x4050 runnable [0x0000000021d0d000]
   java.lang.Thread.State: RUNNABLE
        at jogamp.nativewindow.windows.GDI.SwapBuffers(Native Method)
        at jogamp.opengl.windows.wgl.WGLUtil.SwapBuffers(WGLUtil.java:95)
        at jogamp.opengl.windows.wgl.WindowsWGLDrawable.swapBuffersImpl(WindowsWGLDrawable.java:92)
        at jogamp.opengl.GLDrawableImpl.swapBuffers(GLDrawableImpl.java:88)
        at jogamp.opengl.GLDrawableHelper.invokeGLImpl(GLDrawableHelper.java:1295)
        at jogamp.opengl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:1147)
        at com.jogamp.opengl.awt.GLCanvas$12.run(GLCanvas.java:1442)
        at com.jogamp.opengl.Threading.invoke(Threading.java:223)
        at com.jogamp.opengl.awt.GLCanvas.display(GLCanvas.java:503)
        at org.cef.browser.CefBrowserOsr$8.run(CefBrowserOsr.java:376)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
        at java.awt.EventQueue.access$500(EventQueue.java:97)
        at java.awt.EventQueue$3.run(EventQueue.java:709)
        at java.awt.EventQueue$3.run(EventQueue.java:703)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
```

Hello

I don't see how it would prove the existence of a bug in JOGL. Please provide a reproducer. The AWT thread doesn't seem to be blocked.