cartridges: Prefer cast over isinstance

cartridges/ui/game_details.py

@@ -5,7 +5,7 @@
 import sys
 from datetime import UTC, datetime
 from gettext import gettext as _
-from typing import Any
+from typing import Any, cast
 from urllib.parse import quote
 
 from gi.repository import Adw, Gdk, Gio, GObject, Gtk
@@ -81,11 +81,7 @@ class GameDetails(Adw.NavigationPage):
 
     @Gtk.Template.Callback()
     def _downscale_image(self, _obj, cover: Gdk.Texture | None) -> Gdk.Texture | None:
-        if (
-            cover
-            and isinstance(root := self.props.root, Gtk.Native)
-            and (renderer := root.get_renderer())
-        ):
+        if cover and (renderer := cast(Gtk.Native, self.props.root).get_renderer()):
             cover.snapshot(snapshot := Gtk.Snapshot.new(), 3, 3)
             if node := snapshot.to_node():
                 return renderer.render_texture(node)

cartridges/ui/window.py

@@ -4,7 +4,7 @@
 
 import locale
 from collections.abc import Generator
-from typing import Any, TypeVar
+from typing import Any, TypeVar, cast
 
 from gi.repository import Adw, Gio, GLib, GObject, Gtk
 
@@ -81,9 +81,8 @@ class Window(Adw.ApplicationWindow):
 
     @Gtk.Template.Callback()
     def _show_details(self, grid: Gtk.GridView, position: int):
-        if isinstance(model := grid.props.model, Gio.ListModel):
-            self.details.game = model.get_item(position)
-            self.navigation_view.push_by_tag("details")
+        self.details.game = cast(Gio.ListModel, grid.props.model).get_item(position)
+        self.navigation_view.push_by_tag("details")
 
     @Gtk.Template.Callback()
     def _search_started(self, entry: Gtk.SearchEntry):
@@ -137,11 +136,7 @@ class Window(Adw.ApplicationWindow):
         self.sorter.changed(Gtk.SorterChange.DIFFERENT)
 
     def _edit(self, pos: int):
-        if isinstance(self.grid.props.model, Gio.ListModel) and (
-            game := self.grid.props.model.get_item(pos)
-        ):
-            self.details.game = game
-
+        self.details.game = cast(Gio.ListModel, self.grid.props.model).get_item(pos)
         self.navigation_view.push_by_tag("details")
         self.details.edit()