Enables the media configuration dialog to listen to audio system and device...

Enables the media configuration dialog to listen to audio system and device changes even if the audio system combo box is disabled (via the AUDIO_SYSTEM_DISABLED_PROP portperty).

src/org/jitsi/impl/neomedia/device/DeviceConfiguration.java

@@ -1049,10 +1049,16 @@ public void propertyChange(PropertyChangeEvent event)
         else if (DeviceSystem.PROP_DEVICES.equals(propertyName))
         {
             if (event.getSource() instanceof AudioSystem)
+            {
+                // Try to switch to a new active audio system if we are
+                // currently using the "none" system.
+                switchFromNoneToActiveAudioSystem(
+                        (CaptureDeviceInfo) event.getNewValue());
                 firePropertyChange(
                         PROP_AUDIO_SYSTEM_DEVICES,
                         event.getOldValue(),
                         event.getNewValue());
+            }
         }
         else if (PROP_VIDEO_FRAMERATE.equals(propertyName))
         {
@@ -1237,5 +1243,13 @@ && getAudioSystem().getLocatorProtocol().equals(
                 }
             }
         }
+        // The device has been unplugged checks. It may be good to check if the
+        // current active audio system still have actvie devices. If not, then
+        // we will choose another audio system, or the "none" one if no audio
+        // system is available.
+        else
+        {
+            extractConfiguredAudioCaptureDevices();
+        }
     }
 }