cleaning more teh tree appearance

hot.c

@@ -18,10 +18,17 @@ GtkBox *get_experimental_box_new(){
   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 !"));
-  GtkExpander *expand = gtk_expander_new ("it's me !");
-  gtk_expander_set_expanded (GTK_WIDGET(expand), TRUE);
-  gtk_box_append (experimental_box, expand);
+  GtkExpander *hello = GTK_EXPANDER (gtk_expander_new ("hello !"));
+  gtk_expander_set_expanded (GTK_EXPANDER (hello), TRUE);
+  gtk_widget_set_margin_start (GTK_WIDGET (hello), 0);
+//  g_signal_connect(hello, "activate", G_CALLBACK(on_tree_expander_toggled), hello);
+  gtk_box_append (experimental_box, GTK_WIDGET (hello));
+
+  GtkExpander *it_s_me = GTK_EXPANDER (gtk_expander_new ("it's me !"));
+  gtk_expander_set_expanded (GTK_EXPANDER (it_s_me), FALSE);
+  gtk_widget_set_margin_start(GTK_WIDGET (it_s_me), 20);
+  gtk_box_append (experimental_box, GTK_WIDGET (it_s_me));
+
   gtk_box_append (experimental_box, GTK_WIDGET(gtk_label_new ("\n\n")));
 
   return experimental_box;