another try, but fails as well + added todos

TODO.md

@@ -9,3 +9,8 @@
   - looks like a race condition
   - obviously  with K there  are more loops before  actually switching
     scenes, which doesn't happen with ESC
+    
+    
+- if grid lines is disabled, they appear anyway in the first frame (then disappear)
+
+- changing options mid-game has no effect in most cases, even after a restart

game.go

@@ -53,22 +53,26 @@ func (game *Game) Update() error {
 	scene := game.GetCurrentScene()
 	scene.Update()
 
-	next := scene.GetNext()
-
-	if next != game.CurrentScene {
-		// make sure we stay on the selected scene
-		scene.ResetNext()
-
-		// finally switch
-		game.CurrentScene = next
-	}
-
 	fmt.Printf("Clear Screen: %t\n", ebiten.IsScreenClearedEveryFrame())
 
 	return nil
 }
 
 func (game *Game) Draw(screen *ebiten.Image) {
+	var nextscene Scene
 	scene := game.GetCurrentScene()
+
+	next := scene.GetNext()
+	if next != game.CurrentScene {
+		scene.ResetNext()
+		game.CurrentScene = next
+		nextscene = game.GetCurrentScene()
+		ebiten.SetScreenClearedEveryFrame(nextscene.Clearscreen())
+	}
+
 	scene.Draw(screen)
+
+	if nextscene != nil {
+		nextscene.Draw(screen)
+	}
 }

scene-menu.go

@@ -62,7 +62,6 @@ func (scene *SceneMenu) Update() error {
 }
 
 func (scene *SceneMenu) Draw(screen *ebiten.Image) {
-	ebiten.SetScreenClearedEveryFrame(false)
 	scene.Ui.Draw(screen)
 }
 
@@ -82,6 +81,7 @@ func (scene *SceneMenu) Init() {
 
 	random := NewMenuButton("Start with random patterns",
 		func(args *widget.ButtonClickedEventArgs) {
+			scene.Config.Empty = false
 			scene.Config.Restart = true
 			scene.Leave()
 		})

scene-options.go

@@ -60,7 +60,6 @@ func (scene *SceneOptions) Update() error {
 }
 
 func (scene *SceneOptions) Draw(screen *ebiten.Image) {
-	ebiten.SetScreenClearedEveryFrame(false)
 	scene.Ui.Draw(screen)
 }
 

scene-play.go

@@ -403,8 +403,6 @@ func (scene *ScenePlay) ToggleCellOnCursorPos(alive int64) {
 
 // draw the new grid state
 func (scene *ScenePlay) Draw(screen *ebiten.Image) {
-	ebiten.SetScreenClearedEveryFrame(true)
-
 	// we  fill the whole  screen with  a background color,  the cells
 	// themselfes will be 1px smaller as their nominal size, producing
 	// a nice grey grid with grid lines