diff -r 7b5ba65b246f -r 1391ba7e533f ui/cocoa/BoxContainer.m
--- a/ui/cocoa/BoxContainer.m	Tue Oct 07 14:59:11 2025 +0200
+++ b/ui/cocoa/BoxContainer.m	Tue Oct 07 15:42:18 2025 +0200
@@ -21,12 +21,11 @@
     } else {
         layout.vexpand = TRUE;
         layout.vfill = TRUE;
-        self.newline = FALSE;
     }
     self.uilayout = layout;
     [super addView:view margin:margin];
     if(_orientation == NSUserInterfaceLayoutOrientationVertical) {
-        self.newline = TRUE;
+        self.container->newline = TRUE;
     }
 }