title: How can you stop a branch being deleted in a pull request?
body: <p>How can you stop a branch being accidentally deleted in a pull request?</p>
  
  <p>The issue is the "Complete pull request" has got the "Delete dev after merging" check box, and this seems to be checked by default, which may be because I'm the owner of the repos.</p>
  
  <p>Is there someway to disable this for all users?</p>