UI: A press and release in one event is a press only for the top screen

Key ups go to every screen, so keys don't get stuck, and that included
events that are a press and a release at once, like iOS's back swipe. So
with settings open from the pause menu, a back swipe made the pause
screen try to close too. It isn't on top, so finishDialog refused, but
the screen had already stopped taking input, and once settings closed it
was left on top, ignoring everything.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Common/UI/ScreenManager.cpp

@@ -106,10 +106,13 @@ void ScreenManager::ProcessInputEvent(const QueuedEvent &event) {
 	case QueuedEventType::KEY:
 	{
 		const KeyInput &key = event.key;
-		// Send key up to every screen layer, to avoid stuck keys.
+		// Send key up to every screen layer, to avoid stuck keys. A press and release in one (iOS's back swipe,
+		// the mouse wheel) is a press only for the top one, or every dialog below would act on it too.
 		if (key.flags & KeyInputFlags::UP) {
-			for (auto &layer : stack_) {
-				layer.screen->key(key);
+			KeyInput upOnly = key;
+			upOnly.flags &= ~KeyInputFlags::DOWN;
+			for (size_t i = 0; i < stack_.size(); i++) {
+				stack_[i].screen->key(i == stack_.size() - 1 ? key : upOnly);
 			}
 		} else if (!stack_.empty()) {
 			stack_.back().screen->key(key);