I've inspected thunar's source it seems like 8 and 9 are enough for Unix. I don't know small and cross-platform gtk projects (i know wireshark 1.x and gimp), but you may try to search their code base for `button-press-event` and `->button\s?==\s?8`. If they use some other values too I'll commit a patch. I don't see any barriers for merging. ``` static gboolean thunar_standard_view_button_press_event (GtkWidget *view, GdkEventButton *event, ThunarStandardView *standard_view) { GtkAction *action = NULL;
if (G_LIKELY (event->type == GDK_BUTTON_PRESS)) { /* determine the appropriate action ("back" for button 8, "forward" for button 9) */ if (G_UNLIKELY (event->button == 8)) action = gtk_ui_manager_get_action (standard_view->ui_manager, "/main-menu/go-menu/placeholder-go-history-actions/back"); else if (G_UNLIKELY (event->button == 9)) action = gtk_ui_manager_get_action (standard_view->ui_manager, "/main-menu/go-menu/placeholder-go-history-actions/forward");
```