WIP: (conditional) addition of SSD installation page, some code-reorganizations, fix of stack sidebar tabbing, exit directly without cleanup script

src/main.rs

@@ -1006,8 +1006,20 @@ fn build_ui(app: &Application) {
     window.add_controller(key_ctrl.clone());
     key_ctrl.connect_key_pressed(move |_a, key, _b, _c| {
         if key == gdk::Key::Tab || key == gdk::Key::ISO_Left_Tab {
-            match GtkWindowExt::focus(&window) {
-                Some(w) if w.is::<gtk::ListBoxRow>() && w.parent().unwrap().parent().unwrap().parent().unwrap().parent().unwrap().is::<StackSidebar>() => {
+            if let Some(w) = GtkWindowExt::focus(&window) {
+                let mut is_sidebar_tab = false;
+                if w.is::<gtk::ListBoxRow>() {
+                    if let Some(w_father) = w.parent() {
+                        if let Some(w_grandfather) = w_father.parent() {
+                            if let Some(w_great_grandfather) = w_grandfather.parent() {
+                                if let Some(w_great_great_grandfather) = w_great_grandfather.parent() {
+                                    is_sidebar_tab = w_great_great_grandfather.is::<StackSidebar>();
+                                }
+                            }
+                        }
+                    }
+                }
+                if is_sidebar_tab {
                     let old_focus_idx = w.clone().downcast::<gtk::ListBoxRow>().unwrap().index();
                     let new_focus_idx = old_focus_idx + match key {
                         gdk::Key::Tab => 1,
@@ -1018,9 +1030,8 @@ fn build_ui(app: &Application) {
                         let next_row = list_box.row_at_index(new_focus_idx.try_into().unwrap()).unwrap();
                         next_row.grab_focus();
                         return glib::Propagation::Stop
-                    }
-                },
-                _ => ()
+                    };
+                }
             }
         }
         glib::Propagation::Proceed