Make HelpOption discovery work same as for any other option

[lGSMl]

At the moment custom command options are searched inside command instance and any parent up the inheritance chain

        public IEnumerable<CommandOption> GetOptions()
        {
            var expr = Options.AsEnumerable();
            var rootNode = this;
            while (rootNode.Parent != null)
            {
                rootNode = rootNode.Parent;
                expr = expr.Concat(rootNode.Options.Where(o => o.Inherited));
            }

            return expr;
        }

But for HelpOption search stops if parent does not have it, even though it may be set further up the chain

 public CommandOption? OptionHelp
        {
            get
            {
                if (_optionHelp != null)
                {
                    return _optionHelp;
                }
                return Parent?.OptionHelp?.Inherited == true
                    ? Parent.OptionHelp
                    : null;
            }
            internal set => _optionHelp = value;
        }

It would be more clear, as for me, if OptionHelp would follow same discovery logic as used for other options.

I have hit some inconvenience working with this when trying to create extension method for CommandLineApplication that would clear duplicate options from subcommands if any.

[natemcmaster]

I would be open to a pull request that implements this. I've marked as help-wanted as I'm not planning to implement on my own, but this seems like a valuable enhancement.

[NhungQuang]

https://docs.github.com/github/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax

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[github-actions[bot]]

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