More sorting hacking

Source/LibationWinForms/AvaloniaUI/ViewModels/GridEntryBindingList2.cs

@@ -118,7 +118,7 @@ namespace LibationWinForms.AvaloniaUI.ViewModels
 
 		public void CollapseItem(SeriesEntrys2 sEntry)
 		{
-			foreach (var episode in Items.BookEntries().Where(b => b.Parent == sEntry).ToList())
+			foreach (var episode in Items.BookEntries().Where(b => b.Parent == sEntry).OrderByDescending(lbe => lbe.SeriesIndex).ToList())
 			{
 				Remove(episode);
 			}
@@ -128,11 +128,13 @@ namespace LibationWinForms.AvaloniaUI.ViewModels
 
 		public void ExpandItem(SeriesEntrys2 sEntry)
 		{
-			foreach (var episode in FilterRemoved.BookEntries().Where(b => b.Parent == sEntry).ToList())
+			var sindex = Items.IndexOf(sEntry);
+
+			foreach (var episode in FilterRemoved.BookEntries().Where(b => b.Parent == sEntry).OrderByDescending(lbe => lbe.SeriesIndex).ToList())
 			{
 				if (SearchResults is null || SearchResults.Docs.Any(d => d.ProductId == episode.AudibleProductId))
 				{
-					Add(episode);
+					InsertItem(++sindex, episode);
 				}
 			}
 			sEntry.Liberate.Expanded = true;

Source/LibationWinForms/AvaloniaUI/ViewModels/RowComparer.cs

@@ -9,13 +9,12 @@ using System.Threading.Tasks;
 
 namespace LibationWinForms.AvaloniaUI.ViewModels
 {
-	//TODO keep episodes beneath their parents when other entries compare equal (because as it stands, children always compare > parents.
 	/// <summary>
 	/// This compare class ensures that all top-level grid entries (standalone books or series parents)
 	/// are sorted by PropertyName while all episodes remain immediately beneath their parents and remain
 	/// sorted by series index, ascending.
 	/// </summary>
-	internal class RowComparer : IComparer
+	internal class RowComparer : IComparer, IComparer<GridEntry2>
 	{
 		private static readonly System.Reflection.PropertyInfo HeaderCellPi = typeof(DataGridColumn).GetProperty("HeaderCell", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
 		private static readonly System.Reflection.PropertyInfo CurrentSortingStatePi = typeof(DataGridColumnHeader).GetProperty("CurrentSortingState", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
@@ -29,6 +28,11 @@ namespace LibationWinForms.AvaloniaUI.ViewModels
 			Column = column;
 			PropertyName = Column.SortMemberPath;
 		}
+		public RowComparer(ListSortDirection direction, string propertyName)
+		{
+			SortDirection = direction;
+			PropertyName = propertyName;
+		}
 
 
 		public int Compare(object x, object y)
@@ -50,11 +54,26 @@ namespace LibationWinForms.AvaloniaUI.ViewModels
 			if (geB is LibraryBookEntry2 lbB && lbB.Parent is SeriesEntrys2 seB)
 				parentB = seB;
 
-		
+			if (geA is SeriesEntrys2 && geB is SeriesEntrys2)
+			{
+				//Both are parents. Make sure they never compare equal.
+				var comparison = InternalCompare(geA, geB);
+				if (comparison == 0)
+				{
+					var propBackup = PropertyName;
+					PropertyName = nameof(GridEntry2.Series);
+					comparison = InternalCompare(geA, geB);
+					PropertyName = propBackup;
+					return comparison;
+				}
+				return comparison;
+			}
+
+
 
 			//both a and b are standalone
 			if (parentA is null && parentB is null)
-				return Compare(geA, geB);
+				return InternalCompare(geA, geB);
 
 			//a is a standalone, b is a child
 			if (parentA is null && parentB is not null)
@@ -62,8 +81,22 @@ namespace LibationWinForms.AvaloniaUI.ViewModels
 				// b is a child of a, parent is always first
 				if (parentB == geA)
 					return SortDirection is ListSortDirection.Ascending ? -1 : 1;
+				else if (geA is SeriesEntrys2)
+				{
+					//Both are parents. Make sure they never compare equal.
+					var comparison = InternalCompare(geA, parentB);
+					if (comparison == 0)
+					{
+						var propBackup = PropertyName;
+						PropertyName = nameof(GridEntry2.Series);
+						comparison = InternalCompare(geA, parentB);
+						PropertyName = propBackup;
+						return comparison;
+					}
+					return comparison;
+				}
 				else
-					return Compare(geA, parentB);
+					return InternalCompare(geA, parentB);
 			}
 
 			//a is a child, b is a standalone
@@ -72,28 +105,61 @@ namespace LibationWinForms.AvaloniaUI.ViewModels
 				// a is a child of b, parent is always first
 				if (parentA == geB)
 					return SortDirection is ListSortDirection.Ascending ? 1 : -1;
+				else if (geB is SeriesEntrys2)
+				{
+					//Both are parents. Make sure they never compare equal.
+					var comparison = InternalCompare(parentA, geB);
+					if (comparison == 0)
+					{
+						var propBackup = PropertyName;
+						PropertyName = nameof(GridEntry2.Series);
+						comparison = InternalCompare(parentA, geB);
+						PropertyName = propBackup;
+						return comparison;
+					}
+					return comparison;
+				}
 				else
-					return Compare(parentA, geB);
+					return InternalCompare(parentA, geB);
 			}
 
 			//both are children of the same series, always present in order of series index, ascending
 			if (parentA == parentB)
 				return geA.SeriesIndex.CompareTo(geB.SeriesIndex) * (SortDirection is ListSortDirection.Ascending ? 1 : -1);
 
-			//a and b are children of different series.
-			return Compare(parentA, parentB);
+			//a and b are children of different series. Make sure their parents never compare equal.
+			var comparison2 = InternalCompare(parentA, parentB);
+			if (comparison2 == 0)
+			{
+				var propBackup = PropertyName;
+				PropertyName = nameof(GridEntry2.Series);
+				comparison2 = InternalCompare(parentA, parentB);
+				PropertyName = propBackup;
+				return comparison2;
+			}
+			return comparison2;
 		}
 
 		//Avalonia doesn't expose the column's CurrentSortingState, so we must get it through reflection
 		private ListSortDirection? GetSortOrder()
 			=> CurrentSortingStatePi.GetValue(HeaderCellPi.GetValue(Column)) as ListSortDirection?;
 
-		private int Compare(GridEntry2 x, GridEntry2 y)
+		private int InternalCompare(GridEntry2 x, GridEntry2 y)
 		{
 			var val1 = x.GetMemberValue(PropertyName);
 			var val2 = y.GetMemberValue(PropertyName);
 
 			return x.GetMemberComparer(val1.GetType()).Compare(val1, val2);
 		}
+
+		public int CompareTo(GridEntry2 other)
+		{
+			return Compare(this, other);
+		}
+
+		public int Compare(GridEntry2 x, GridEntry2 y)
+		{
+			return Compare((object)x, (object)y) * (SortDirection is ListSortDirection.Ascending ? 1 : -1);
+		}
 	}
 }

Source/LibationWinForms/AvaloniaUI/Views/ProductsDisplay2.axaml.cs

@@ -171,7 +171,7 @@ namespace LibationWinForms.AvaloniaUI.Views
 		{
 			if (CurrentSortColumn is null)
 			{
-				bindingList.InternalList.Sort((i1, i2) => i2.DateAdded.CompareTo(i1.DateAdded));
+				bindingList.InternalList.Sort(new RowComparer(ListSortDirection.Descending, nameof(GridEntry2.DateAdded)));
 				bindingList.ResetCollection();
 			}
 			else