replace ObservableHashSet with ObservableSortedSet

src/SharpIDE.Application/Features/SolutionDiscovery/SharpIdeModelComparers.cs

@@ -0,0 +1,31 @@
+namespace SharpIDE.Application.Features.SolutionDiscovery;
+
+public class SharpIdeFileComparer : IComparer<SharpIdeFile>
+{
+	public static readonly SharpIdeFileComparer Instance = new SharpIdeFileComparer();
+	public int Compare(SharpIdeFile? x, SharpIdeFile? y)
+	{
+		if (ReferenceEquals(x, y)) return 0;
+		if (x is null) return -1;
+		if (y is null) return 1;
+
+		int result = string.Compare(x.Path, y.Path, StringComparison.OrdinalIgnoreCase);
+
+		return result;
+	}
+}
+
+public class SharpIdeFolderComparer : IComparer<SharpIdeFolder>
+{
+	public static readonly SharpIdeFolderComparer Instance = new SharpIdeFolderComparer();
+	public int Compare(SharpIdeFolder? x, SharpIdeFolder? y)
+	{
+		if (ReferenceEquals(x, y)) return 0;
+		if (x is null) return -1;
+		if (y is null) return 1;
+
+		int result = string.Compare(x.Path, y.Path, StringComparison.OrdinalIgnoreCase);
+
+		return result;
+	}
+}