Feature: Group by Dynamic Selector Function (#849)

Addresses #848 by providing new overloads for the `Group` operator that allow the user to supply a `IObservable<Func<TObject, TKey, TGroupKey>>` so that the function that is used to obtain the GroupKey can change dynamically. When a new value is supplied, a new GroupKey will be obtained for each item, and if the GroupKey has changed, the item will be moved to the new Group. Also allows for an optional `IObservable<Unit>` parameter that will force the current GroupKey selector to be re-applied to all the items.
reactivemarbles · Feb 14, 2024 · 9b09d9c · 9b09d9c
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diff --git a/src/DynamicData.Tests/API/ApiApprovalTests.DynamicDataTests.DotNet8_0.verified.txt b/src/DynamicData.Tests/API/ApiApprovalTests.DynamicDataTests.DotNet8_0.verified.txt
@@ -1367,6 +1367,14 @@ namespace DynamicData
             where TObject :  notnull
             where TKey :  notnull
             where TGroupKey :  notnull { }
+        public static System.IObservable<DynamicData.IGroupChangeSet<TObject, TKey, TGroupKey>> Group<TObject, TKey, TGroupKey>(this System.IObservable<DynamicData.IChangeSet<TObject, TKey>> source, System.IObservable<System.Func<TObject, TGroupKey>> groupSelectorKeyObservable, System.IObservable<System.Reactive.Unit>? regrouper = null)
+            where TObject :  notnull
+            where TKey :  notnull
+            where TGroupKey :  notnull { }
+        public static System.IObservable<DynamicData.IGroupChangeSet<TObject, TKey, TGroupKey>> Group<TObject, TKey, TGroupKey>(this System.IObservable<DynamicData.IChangeSet<TObject, TKey>> source, System.IObservable<System.Func<TObject, TKey, TGroupKey>> groupSelectorKeyObservable, System.IObservable<System.Reactive.Unit>? regrouper = null)
+            where TObject :  notnull
+            where TKey :  notnull
+            where TGroupKey :  notnull { }
         public static System.IObservable<DynamicData.IGroupChangeSet<TObject, TKey, TGroupKey>> GroupOnObservable<TObject, TKey, TGroupKey>(this System.IObservable<DynamicData.IChangeSet<TObject, TKey>> source, System.Func<TObject, System.IObservable<TGroupKey>> groupObservableSelector)
             where TObject :  notnull
             where TKey :  notnull