diff -r 83c83a7aa552 -r b459361d98ad ui/gtk/toolkit.h
--- a/ui/gtk/toolkit.h	Tue Dec 16 18:09:15 2025 +0100
+++ b/ui/gtk/toolkit.h	Wed Dec 17 18:31:20 2025 +0100
@@ -159,6 +159,8 @@
     UiObserver  **observers;
     ui_callback callback;
     void        *userdata;
+    int         customint1;
+    int         customint2;
 } UiVarEventData;
 
 typedef enum UiOrientation UiOrientation;