Simplify select-all reset helper

ErsatzTV.Core.Tests/Pages/MediaCardSelectionHelperTests.cs

@@ -18,10 +18,9 @@ public class MediaCardSelectionHelperTests
         var first = new MediaCardViewModel(2, "First", "Sub", "First", "", Core.Domain.MediaItemState.Normal, false);
         var second = new MediaCardViewModel(3, "Second", "Sub", "Second", "", Core.Domain.MediaItemState.Normal, false);
 
-        MediaCardViewModel last = MultiSelectBase<Search>.ResetSelectionWithCards(selected, new[] { first, second });
+        MultiSelectBase<Search>.ResetSelectionWithCards(selected, new[] { first, second });
 
         selected.ShouldBe(new[] { first, second }, ignoreOrder: true);
-        last.ShouldBe(second);
     }
 
     [Test]
@@ -30,9 +29,8 @@ public class MediaCardSelectionHelperTests
         var existingCard = new MediaCardViewModel(1, "Existing", "Sub", "Existing", "", Core.Domain.MediaItemState.Normal, false);
         var selected = new HashSet<MediaCardViewModel> { existingCard };
 
-        MediaCardViewModel last = MultiSelectBase<Search>.ResetSelectionWithCards(selected, []);
+        MultiSelectBase<Search>.ResetSelectionWithCards(selected, []);
 
         selected.ShouldBeEmpty();
-        last.ShouldBeNull();
     }
 }

ErsatzTV/Pages/MultiSelectBase.cs

@@ -248,15 +248,11 @@ public class MultiSelectBase<T> : FragmentNavigationBase
         }
     }
 
-    internal static MediaCardViewModel ResetSelectionWithCards(
+    internal static void ResetSelectionWithCards(
         ISet<MediaCardViewModel> selectedItems,
         IEnumerable<MediaCardViewModel> cards)
     {
-        List<MediaCardViewModel> cardList = (cards ?? Enumerable.Empty<MediaCardViewModel>()).ToList();
-
         selectedItems.Clear();
-        selectedItems.UnionWith(cardList);
-
-        return cardList.LastOrDefault();
+        selectedItems.UnionWith(cards);
     }
 }