patch-renpy_display_core.py/files/renpy6

--- renpy/display/core.py.orig  2014-10-17 08:18:33.000000000 +0900
+++ renpy/display/core.py   2021-04-15 09:46:11.988857000 +0900
@@ -1494,7 +1494,10 @@
             return

         self.window_caption = caption
-        pygame.display.set_caption(caption.encode("utf-8"))
+        if isinstance(caption, unicode):
+            pygame.display.set_caption(caption)
+        else:
+            pygame.display.set_caption(caption.encode("utf-8"))

     def iconify(self):
         pygame.display.iconify()