Fix saving of saves from other machines.

Need to reset the persisted save paths on load, since the file that was
loaded may have been moved since it was saved and the original location
may no longer be accessible.

Fixes https://github.com/dcs-liberation/dcs_liberation/issues/2756.

game/persistence/savemanager.py

@@ -17,9 +17,14 @@ class SaveManager:
     def __init__(self, game: Game) -> None:
         self.game = game
         self.player_save_location: Path | None = None
-        self.autosave_path = self.default_save_directory() / "autosave.liberation.zip"
         self.last_saved_bundle: SaveGameBundle | None = None
 
+    @property
+    def autosave_path(self) -> Path:
+        # This is a property rather than a member because it's one less thing we need to
+        # update when loading a save that may have been copied from another machine.
+        return self.default_save_directory() / "autosave.liberation.zip"
+
     @property
     def default_save_location(self) -> Path:
         if self.player_save_location is not None:
@@ -46,6 +51,19 @@ class SaveManager:
         with self._save_bundle_context() as bundle:
             bundle.save_start_of_turn(self.game)
 
+    def set_loaded_from(self, bundle: SaveGameBundle) -> None:
+        """Reconfigures this save manager based on the loaded game.
+
+        The SaveManager is persisted to Game, including details like the last saved path
+        and bundle details. This data is no longer valid if the save was moved manually
+        (such as from one machine to another), so it needs to be replaced with the load
+        location.
+
+        This should only be called by SaveGameBundle after a game load.
+        """
+        self.player_save_location = bundle.bundle_path
+        self.last_saved_bundle = bundle
+
     @contextmanager
     def _save_bundle_context(
         self, override_destination: Path | None = None