--- a/ui/qt/container.h	Sun Dec 07 11:27:44 2025 +0100
+++ b/ui/qt/container.h	Sun Dec 07 11:51:01 2025 +0100
@@ -39,6 +39,7 @@
 #include <QTabWidget>
 #include <QStackedWidget>
 #include <QSplitter>
+#include <QGroupBox>
 
 #define ui_obj_container(obj) (UiContainerPrivate*)((UiContainerX*)obj->container_end)->container
 
@@ -54,6 +55,8 @@
 public:
     QBoxLayout            *box;
     bool                  hasStretchedWidget = false;
+    bool                  singleChild = false;
+    bool                  hasChild = false;
     QSpacerItem           *space;
     QBoxLayout::Direction direction;