Fix the control window losing focus when you resize the presenter window.

src/control_ui.cpp

@@ -89,10 +89,10 @@ void ControlUI::render(sf::RenderWindow& window, SlideDeck& deck) {
 void ControlUI::full_screen(bool do_it) {
   if(do_it) {
     $presenter.setSize($window_size);
-    $presenter.setMouseCursorVisible(false);
+    $controller.requestFocus();
   } else {
     $presenter.setSize({$window_size.x/2, $window_size.y/2});
-    $presenter.setMouseCursorVisible(true);
+    $controller.requestFocus();
   }
 
   $full_screen = do_it;

src/main.cpp

@@ -67,15 +67,14 @@ int main(int argc, char *argv[]) {
       return a.size.x == WINDOW_WIDTH && a.size.y == WINDOW_HEIGHT;
   });
 
-  sf::RenderWindow controller(sf::VideoMode({CONTROL_WIDTH, CONTROL_HEIGHT}), "Bezos Loves Control");
-
   sf::RenderWindow presenter(*screen_mode,
       "Bezos Loves Slides", sf::Style::None, sf::State::Windowed);
-  presenter.setMouseCursorVisible(false);
 
   presenter.setFramerateLimit(FRAME_LIMIT);
   presenter.setVerticalSyncEnabled(VSYNC);
 
+  sf::RenderWindow controller(sf::VideoMode({CONTROL_WIDTH, CONTROL_HEIGHT}), "Bezos Loves Control");
+
   auto backend = std::make_shared<gui::Backend>();
 
   auto slides = load_slides(argv[1], backend);