Pushing new branches does not set up tracking branch completely

When you push a local branch that does not exist on the remote (using the refspec overload), libgit2sharp automatically creates a tracking branch, but it does not set up the config for the local branch

i.e. the following config entries are missing:

branch.(branch_name).remote
branch.(branch_name).merge

Currently, I push a new branch like as follows:

string refspec = string.Format("{0}:{1}",
    currentBranch.CanonicalName, currentBranch.CanonicalName);
repo.Network.Push(remote, refspec, handler, credentials);
repo.Branches.Update(repo.Head, delegate(BranchUpdater updater)
{
    updater.Remote = remote.Name;
    updater.UpstreamBranch = repo.Head.CanonicalName;
});

I feel like this should be simplified. Either by doing the BranchUpdater stuff in Push(), or by extending the Push(Branch, ...) overload to let it accept non-tracking branches and do the whole process.

I also did not find a test fixture covering that feature, so the intended behaviour should at least be specified.

首先阅读 issue 中展示的 Push 重载和 BranchUpdater 的使用方式，然后检查现有的 push 测试 fixture，因为 issue 表明没有任何 fixture 覆盖此行为。完成的标准是，受支持的新分支 push 路径能够建立 branch.remote 和 branch.merge 配置，并有一个测试明确指定预期行为。