Fix Windows channel tree ordering

tests/VoiceCat.Tests/WindowsManagedClientTests.cs

@@ -8,6 +8,28 @@ namespace VoiceCat.Tests;
 
 public class WindowsManagedClientTests
 {
+    private static readonly AudioConfigInfo DefaultAudio = new(0, false, 48_000, 64_000, 20, 0, true, 10, false, 10, false);
+
+    [Fact]
+    public void ChannelHierarchyUsesServerSortOrderAndKeepsIdsWithDisplayedChannels()
+    {
+        ChannelInfo[] channels =
+        [
+            new(10, 0, "Zulu", "", false, 0, -10, DefaultAudio),
+            new(20, 0, "Alpha", "", false, 0, 20, DefaultAudio),
+            new(11, 10, "Zulu child", "", false, 0, 10, DefaultAudio),
+            new(12, 10, "Alpha child", "", false, 0, 0, DefaultAudio),
+            new(30, 0, "Beta", "", false, 0, 20, DefaultAudio),
+        ];
+
+        IReadOnlyList<ChannelHierarchyItem> roots = ChannelHierarchy.Build(channels);
+
+        Assert.Equal([(10U, "Zulu"), (20U, "Alpha"), (30U, "Beta")],
+            roots.Select(item => (item.Channel.Id, item.Channel.Name)));
+        Assert.Equal([(12U, "Alpha child"), (11U, "Zulu child")],
+            roots[0].Children.Select(item => (item.Channel.Id, item.Channel.Name)));
+    }
+
     private static async Task Until(Client client, Func<bool> predicate)
     {
         using var timeout = new CancellationTokenSource(TimeSpan.FromSeconds(10));