Avoid printing trailing whitespace in help output

[djc]

Please complete the following tasks

• I have searched the discussions
• I have searched the open and rejected issues

Clap Version

4.3.21

Describe your use case

In the rustup project, we use the trycmd crate to make sure we don't regress help output. However, while upgrading clap from 3 to 4, I noticed that clap 4 seems to output trailing spaces in some cases:

Personally, I have configured VS Code to files.trimTrailingWhitespace which I believe is helpful in most cases. As such, it has proven to be challenging to fix up the trycmd snapshots.

Describe the solution you'd like

Ideally I think clap should not output trailing whitespace.

Alternatives, if applicable

Do nothing, I guess -- I suppose this is a niche concern.

Additional Context

No response

[epage]

So far I've not been too particular about trailing whitespace so long as it doesn't get styled because it can add a bit of bookkeeping (affecting binary size) for something most people won't see.