src/java.desktop/macosx/native/libawt_lwawt/awt/AWTWindow.m

*** 1169,1178 ****
--- 1169,1180 ----
      }];
  
  JNF_COCOA_EXIT(env);
  }
  
+ extern jboolean metalEnabled;
+ 
  /*
   * Class:     sun_lwawt_macosx_CPlatformWindow
   * Method:    nativeGetNSWindowInsets
   * Signature: (J)Ljava/awt/Insets;
   */
*** 1195,1204 ****
--- 1197,1210 ----
  
      jint top = (jint)(frame.size.height - contentRect.size.height);
      jint left = (jint)(contentRect.origin.x - frame.origin.x);
      jint bottom = (jint)(contentRect.origin.y - frame.origin.y);
      jint right = (jint)(frame.size.width - (contentRect.size.width + left));
+     if (metalEnabled == JNI_TRUE) {
+         bottom -= top;
+         top = 0;
+     }
  
      static JNF_CLASS_CACHE(jc_Insets, "java/awt/Insets");
      static JNF_CTOR_CACHE(jc_Insets_ctor, jc_Insets, "(IIII)V");
      ret = JNFNewObject(env, jc_Insets_ctor, top, left, bottom, right);