Updating a github pull request does not update the test email

[keybounce]

So I am new to github pull requests.

(Background: I'm not new to email systems. But I have no clue how to configure sendmail-based systems, consider that config file to be black magic, and Apple doesn't give any docs. It does not "just work" out of the box. My default email setup uses Mail.app as an imap client.)

I attempted to make a pull request, #421 -- git/git#421 . The test email showed problems -- the message at the front wasn't formatted right, and the subject wasn't correct.

So, a little fixing, and at least the message is right. Another test, ... and the test message has not changed, does not reflect the updated message.

Also, even though I changed the subject in the pull request, the subject provided is still from the original github commit

How do I fix what I am doing wrong?