further clear screen debugging

TODO.md

@@ -1,5 +1,11 @@
 - add all other options like size etc
-- clear screen  disabled leads to zoom artifacts when  zooming out and
-  canvas  is smaller  than  screen workaround:  using  screen copy  in
-  game.Screen. Play  copies screen to it  and Menu draws it  to screen
-  before drawing the menus
+
+- Clear screen problem:
+  - it works when hitting the K key, immediately
+  - its being turned off correctly when entering menu and on when leaving it
+  - but  regardless of the setting,  after turning it off,  the engine
+    seems to run a couple of  ticks with the old setting before switching
+    scenes
+  - looks like a race condition
+  - obviously  with K there  are more loops before  actually switching
+    scenes, which doesn't happen with ESC