AppSettings::SubcommandRequiredElseHelp affects "leaf" subcommands that don't have own subcommands

[heroin-moose]

Please complete the following tasks

• I have searched the discussions
• I have searched the existing issues

Rust Version

rustc 1.57.0 (f1edd0429 2021-11-29)

Clap Version

3.0.5

Minimal reproducible code

use clap::App;
use clap::AppSettings;

fn main() {
    let args = App::new("test")
        .global_setting(AppSettings::InferSubcommands)
        .global_setting(AppSettings::SubcommandRequiredElseHelp)
        .subcommands(vec![
            App::new("parent")
                .subcommands(vec![
                    App::new("child")
                ])
        ]);

    args.get_matches();
}

Steps to reproduce the bug with the above code

cargo run -- parent child

Actual Behaviour

A help message is displayed and program exists with status 2.

Expected Behaviour

This code should not trigger an error because commands that don't have subcommands should not be affected by this flag.

Additional Context

No response

Debug Output

No response

[epage]

Looks like this is a duplicate of #2513 (which uses yaml, making searching for it harder) . Let's continue the conversation over there.