Space/Backspace, Up/Down, PageUp/PageDown now all move the next/prev slide.

src/slides_ui.cpp

@@ -219,6 +219,24 @@ void SlidesUI::handle_events(sf::RenderWindow& presenter, const sf::Event& event
       mouse(pos.x, pos.y, {1 << guecs::ModBit::right});
     }
   }
+
+  if(const auto* key = event.getIf<sf::Event::KeyPressed>()) {
+    using KEY = sf::Keyboard::Scan;
+    switch(key->scancode) {
+      case KEY::Space:
+      case KEY::PageDown:
+      case KEY::Down:
+        next_slide();
+        break;
+      case KEY::Backspace:
+      case KEY::PageUp:
+      case KEY::Up:
+        prev_slide();
+        break;
+      default:
+        break;
+    }
+  }
 }
 
 void SlidesUI::configure_layouts() {