Fix items in Translucent bucket not be rendered in AWT panels

jme3-desktop/src/main/java/com/jme3/system/awt/AwtPanel.java

@@ -288,11 +288,7 @@ public class AwtPanel extends Canvas implements SceneProcessor {
         repaintRequest.set(true);
     }
 
-    public void postFrame(FrameBuffer out) {
+    void onFrameEnd() {
-        if (!attachAsMain && out != fb){
-            throw new IllegalStateException("Why did you change the output framebuffer?");
-        }
-        
         if (reshapeNeeded.getAndSet(false)) {
             reshapeInThread(newWidth, newHeight);
         } else {
@@ -316,6 +312,14 @@ public class AwtPanel extends Canvas implements SceneProcessor {
         }
     }
     
+    public void postFrame(FrameBuffer out) {
+        if (!attachAsMain && out != fb){
+            throw new IllegalStateException("Why did you change the output framebuffer?");
+        }
+        
+        // onFrameEnd();
+    }
+    
     public void reshape(ViewPort vp, int w, int h) {
     }
 

jme3-desktop/src/main/java/com/jme3/system/awt/AwtPanelsContext.java

@@ -186,6 +186,10 @@ public class AwtPanelsContext implements JmeContext {
         }
 
         listener.update();
+        
+        for (AwtPanel panel : panels){
+            panel.onFrameEnd();
+        }
     }
 
     private void destroyInThread(){