[fix] Fixed an issue that scenes were drawn even right after it's ended.

src/sj/AbstractGame.d

@@ -11,13 +11,17 @@ class AbstractGame {
  public:
   ///
   this(SceneInterface first_scene) in (first_scene) {
-    next_scene_ = first_scene;
+    scene_ = first_scene;
   }
 
   ///
   void Update(KeyInput input) {
-    scene_      = next_scene_;
-    next_scene_ = scene_.Update(input);
+    while (true) {
+      auto next_scene = scene_.Update(input);
+      if (next_scene is scene_) break;
+
+      scene_ = next_scene;
+    }
   }
   ///
   void Draw() {
@@ -26,6 +30,4 @@ class AbstractGame {
 
  private:
   SceneInterface scene_;
-
-  SceneInterface next_scene_;
 }

src/sj/LoadingScene.d

@@ -105,7 +105,6 @@ class LoadingScene : SceneInterface {
     return this;
   }
   override void Draw() {
-    if (anime_.isFinished) return;
     lobby_.Draw();
     loading_text_.Draw(lobby_.Projection, lobby_.view.Create());
   }

src/sj/PlayScene.d

@@ -49,6 +49,8 @@ class PlayScene : SceneInterface {
     beat_ = music_.beat;
 
     if (beat_ >= context_.length) {
+      context_.destroy();
+
       music_.StopPlaying();
       posteffect_.Initialize();
 
@@ -80,10 +82,6 @@ class PlayScene : SceneInterface {
     context_.DrawBackground();
     context_.DrawElements();
     context_.DrawActor();
-
-    if (beat_ >= context_.length) {
-      context_.destroy();
-    }
   }
 
  private: