Don't use twice the same setting

dungeonbattle/menus.py

@@ -76,12 +76,14 @@ class SettingsMenu(Menu):
     def handle_key_pressed(self, key: Optional[KeyValues], raw_key: str,
                            game: Any) -> None:
         """
-        For now, in the settings mode, we can only go backwards.
+        Update settings
         """
         if not self.waiting_for_key:
+            # Navigate normally through the menu.
             if key == KeyValues.SPACE or \
                     key == KeyValues.ENTER and \
                     self.position == len(self.values) - 1:
+                # Go back
                 game.display_actions(DisplayActions.UPDATE)
                 game.state = GameMode.MAINMENU
             if key == KeyValues.DOWN:
@@ -89,6 +91,7 @@ class SettingsMenu(Menu):
             if key == KeyValues.UP:
                 self.go_up()
             if key == KeyValues.ENTER and self.position < len(self.values) - 3:
+                # Change a setting
                 option = list(game.settings.settings_keys)[self.position]
                 if option == "TEXTURE_PACK":
                     game.settings.TEXTURE_PACK = \
@@ -101,6 +104,10 @@ class SettingsMenu(Menu):
                     self.update_values(game.settings)
         else:
             option = list(game.settings.settings_keys)[self.position]
+            # Don't use an already mapped key
+            if any(getattr(game.settings, opt) == raw_key
+                   for opt in game.settings.settings_keys if opt != option):
+                return
             setattr(game.settings, option, raw_key)
             game.settings.write_settings()
             self.waiting_for_key = False