Test for inherited option ordering

Tests/CommandLineTests.cs

@@ -128,6 +128,17 @@ public static void TestMore()
             == ClassifyJson.Serialize(CommandLineParser.Parse<Test2Cmd>(["del", "this"])));
     }
 
+    [Fact]
+    public static void TestSubcommandIntermediate()
+    {
+        var c3 = CommandLineParser.Parse<Test3Cmd>(["sub", "base", "subbase", "item"]);
+        Assert.IsType<Test3SubCmd>(c3.Cmd);
+        var cs3 = (Test3SubCmd) c3.Cmd;
+        Assert.Equal("base", cs3.Base);
+        Assert.Equal("subbase", cs3.SubBase);
+        Assert.Equal("item", cs3.ItemName);
+    }
+
     [Fact]
     public static void TestPostBuild()
     {
@@ -136,6 +147,7 @@ public static void TestPostBuild()
         CommandLineParser.PostBuildStep<CommandLineWithArray>(reporter);
         CommandLineParser.PostBuildStep<Test1Cmd>(reporter);
         CommandLineParser.PostBuildStep<Test2Cmd>(reporter);
+        CommandLineParser.PostBuildStep<Test3Cmd>(reporter);
     }
 
     class Reporter : IPostBuildReporter

Tests/Test3.cs

@@ -0,0 +1,27 @@
+namespace RT.CommandLine.Tests;
+
+class Test3Cmd
+{
+    [IsPositional, IsMandatory]
+    public Test3CmdBase Cmd;
+}
+
+[CommandGroup]
+abstract class Test3CmdBase
+{
+    [IsPositional, IsMandatory]
+    public string Base;
+}
+
+abstract class Test3CmdSubBase : Test3CmdBase
+{
+    [IsPositional, IsMandatory]
+    public string SubBase;
+}
+
+[CommandName("sub")]
+sealed class Test3SubCmd : Test3CmdSubBase
+{
+    [IsPositional, IsMandatory]
+    public string ItemName;
+}