cleaning gtk_box_append (tree_sketch_box, GTK_WIDGET (get_experimental_box_new()));

hot.c

@@ -13,3 +13,13 @@
 //  GTK_ORIENTATION_VERTICAL       GTK_ORIENTATION_HORIZONTAL
 
 
+GtkBox *get_experimental_box_new(){
+  GtkBox *experimental_box = GTK_BOX(gtk_box_new (GTK_ORIENTATION_VERTICAL, 0));
+  gtk_box_append (experimental_box, GTK_WIDGET(gtk_separator_new (GTK_ORIENTATION_HORIZONTAL)));
+  gtk_box_append (experimental_box, GTK_WIDGET(gtk_label_new ("\n\n")));
+
+  gtk_box_append (experimental_box, gtk_expander_new ("hello !"));
+
+  return experimental_box;
+}
+

hot.h

@@ -13,4 +13,4 @@
 #include "contain.h"
 
 GtkWidget *get_run_rules_page_new();
-
+GtkBox *get_experimental_box_new();

tree.c

@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <gtk-4.0/gtk/gtk.h>
 
+#include "hot.h"
 #include "warm.h"
 #include "cold.h"
 #include "display.h"
@@ -261,8 +262,10 @@ static void ui_create_tree (GtkWidget *target_widget)
 }
 
 GtkBox *get_rules_user_tree_new(){
-  GtkBox *tree_sketch = GTK_BOX(gtk_box_new (GTK_ORIENTATION_VERTICAL, 0));
-  ui_create_tree (GTK_WIDGET (tree_sketch));
-  return tree_sketch;
+  GtkBox *tree_sketch_box = GTK_BOX(gtk_box_new (GTK_ORIENTATION_VERTICAL, 0));
+  ui_create_tree (GTK_WIDGET (tree_sketch_box));
+
+  gtk_box_append (tree_sketch_box, GTK_WIDGET (get_experimental_box_new()));
+  return tree_sketch_box;
 }
 

tree.d

@@ -1,3 +1,3 @@
-tree.o: tree.c warm.h \
+tree.o: tree.c hot.h warm.h \
  /gnu/store/fkmpkdav2zmz1k72989bdgpdrfac7rz1-glib-2.78.0/include/glib-2.0/glib.h \
  cold.h display.h contain.h texts.h