a18y: add handy keyboard shortcuts

src/application.rs

@@ -86,6 +86,7 @@ mod imp {
                 }),
             );
             application.set_accels_for_action("app.quit", &["<Control>q"]);
+            application.set_accels_for_action("app.skip-tour", &["Escape"]);
             self.parent_startup(application);
         }
     }

src/widgets/paginator.rs

 use gtk::prelude::*;
 use gtk::{
+    gdk,
     glib::{self, clone},
     subclass::prelude::*,
 };
@@ -68,6 +69,19 @@ mod imp {
                 .connect_position_notify(clone!(@weak obj => move |_| {
                     obj.update_position();
                 }));
+
+            let controller = gtk::EventControllerKey::new();
+            controller.connect_key_pressed(clone!(@weak obj => @default-return gtk::Inhibit(true), move |_controller, keyval, _keycode, _state| {
+                if keyval == gdk::Key::Right {
+                    obj.try_next();
+                } else if keyval == gdk::Key::Left {
+                    obj.try_previous();
+                }
+                gtk::Inhibit(false)
+            }));
+
+            obj.add_controller(&controller);
+
             self.parent_constructed(obj);
         }
     }