diff -r 376ef91111f6 -r b174e721663e ui/gtk/toolkit.h
--- a/ui/gtk/toolkit.h	Wed Dec 17 22:36:41 2025 +0100
+++ b/ui/gtk/toolkit.h	Sat Dec 27 22:47:56 2025 +0100
@@ -159,6 +159,8 @@
     UiObserver  **observers;
     ui_callback callback;
     void        *userdata;
+    int         customint1;
+    int         customint2;
 } UiVarEventData;
 
 typedef enum UiOrientation UiOrientation;