git checkout won't detach head when a reference equals the detach point

Hello,

Kind of convoluted, and perhaps not even an error.

On a repository with a remote tracking branch, say remotes/origin/master, then do this:

git checkout -b temp origin/master
git checkout origin/master
git branch
 * temp

This might seem like an odd thing to want to do, but I found this because the next thing I wanted to do was

git branch -D temp

Which won't work because the branch hasn't changed.

Andy