AWTSettingsDialog: System.gc() - intentional double call

jme3-awt-dialogs/src/main/java/com/jme3/awt/AWTSettingsDialog.java

@@ -563,7 +563,10 @@ public final class AWTSettingsDialog extends JFrame {
                     // on Linux when using AWT/Swing + GLFW.
                     // For more info see:
                     // https://github.com/LWJGL/lwjgl3/issues/149,
-                    // https://hub.jmonkeyengine.org/t/experimenting-lwjgl3/37275
+
+                    //  intentional double call. see this discussion:
+                    //  https://hub.jmonkeyengine.org/t/experimenting-lwjgl3/37275/12
+                    System.gc();
                     System.gc();
                 }
             }