collections: Use a set for game ids

cartridges/collections.py

@@ -36,7 +36,7 @@ class Collection(Gio.SimpleActionGroup):
     def __init__(self, **kwargs: Any):
         super().__init__(**kwargs)
 
-        self.game_ids = self.game_ids or []
+        self.game_ids = self.game_ids or set()
         self.bind_property(
             "icon",
             self,
@@ -81,12 +81,12 @@ def _get_collections() -> Generator[Collection]:
             yield Collection(
                 name=data["name"],
                 icon=data["icon"],
-                game_ids=[
+                game_ids={
                     ident
                     for ident in data["game-ids"]
                     if not ident.startswith(imported.ID)
                     or ident in manually_added_game_ids
-                ],
+                },
             )
         except (KeyError, TypeError):
             continue
@@ -111,7 +111,7 @@ def save():
                 {
                     "name": GLib.Variant.new_string(collection.name),
                     "icon": GLib.Variant.new_string(collection.icon),
-                    "game-ids": GLib.Variant.new_strv(collection.game_ids),
+                    "game-ids": GLib.Variant.new_strv(tuple(collection.game_ids)),
                     "removed": GLib.Variant.new_boolean(collection.removed),
                 }
                 for collection in cast(Iterable[Collection], model)

cartridges/ui/collections.py

@@ -114,12 +114,11 @@ class CollectionsBox(Adw.Bin):
         for button in cast(Iterable[CollectionButton], self.box):
             game_ids = button.collection.game_ids
             old_game_ids = game_ids.copy()
-            in_collection = self.game.game_id in game_ids
 
-            if button.props.active and not in_collection:
-                game_ids.append(self.game.game_id)
-            elif not button.props.active and in_collection:
-                game_ids.remove(self.game.game_id)
+            if button.props.active:
+                game_ids.add(self.game.game_id)
+            else:
+                game_ids.discard(self.game.game_id)
 
             if game_ids != old_game_ids:
                 filter_changed = True

cartridges/ui/window.py

@@ -267,7 +267,7 @@ class Window(Adw.ApplicationWindow):
     def _add_collection(self, game_id: str | None = None):
         collection = Collection()
         if game_id:
-            collection.game_ids.append(game_id)
+            collection.game_ids.add(game_id)
 
         details = CollectionDetails(collection=collection)
         details.present(self)