fix issues #1193 and #1558 for Linux/Windows (LWJGL v3 hangs)

jme3-lwjgl3/src/main/java/com/jme3/system/lwjgl/LwjglWindow.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009-2020 jMonkeyEngine
+ * Copyright (c) 2009-2021 jMonkeyEngine
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -57,6 +57,8 @@
 import java.util.logging.Logger;
 import org.lwjgl.Version;
 import org.lwjgl.glfw.*;
+import org.lwjgl.system.Platform;
+
 import static org.lwjgl.glfw.GLFW.*;
 import static org.lwjgl.opengl.GL11.GL_FALSE;
 import static org.lwjgl.system.MemoryUtil.NULL;
@@ -477,10 +479,21 @@ public void create(boolean waitFor) {
             return;
         }
 
-        // NOTE: this is required for Mac OS X!
-        mainThread = Thread.currentThread();
-        mainThread.setName("jME3 Main");
-        run();
+        if (Platform.get() == Platform.MACOSX) {
+            // NOTE: this is required for Mac OS X!
+            mainThread = Thread.currentThread();
+            mainThread.setName("jME3 Main");
+            if (waitFor) {
+                LOGGER.warning("create(true) is not supported for macOS!");
+            }
+            run();
+        } else {
+            new Thread(this, "jME3 Main").start();
+            if (waitFor) {
+                waitFor(true);
+            }
+        }
+
     }
 
     /**