Changing source branch for PR on Github : <p>I accidentally created a pull request from the master-branch of my fork of a repo.</p>

<p>While trying to rebase it I noticed that all of these changes were pushed into that pull request — due to the fact that you can simply <code>Add more commits by pushing to the master branch on username/repo</code></p>

<ul>
<li><strong>Can you change the source branch of a pull request <em>after</em> the pull request has been submitted?</strong></li>
</ul>

<p>I see you can edit the base branch, but that's obviously not what I'm after.</p>
