TestAWTPanels crashes with LWJGL v3 on Linux #1558

With "jme3-lwjgl3" in JME v3.4.0-beta4, TestAWTPanels hangs. No output is generated, and no window appears.

Debugger suggests a deadlock, with the "jME Main" thread parked in line 103:

            panelsAreReady.await();