BranchUserApi.checkout() doesn't update the HEAD ref

[richteambs]

After calling mybranch.checkout() the HEAD ref is unaffected. HEAD should always point to the latest commit in the current branch (unless in detached head mode).

To Reproduce

https://codepen.io/richtea43/pen/abOdRzr?editors=0010

Expected behavior

The HEAD ref should always point to the latest commit in the current branch (unless in detached head mode). Anyone using git would expect HEAD to be set after a checkout.

Context

• Which library is impacted? @gitgraph/core
• Which version of the library is it? Latest code in master branch
• What browser and version is impacted? N/A

Additional information

The code for commit is here - it doesn't update HEAD. The only time HEAD is updated is when committing (see here).

[richtea]

Apologies, I accidentally used my work account to open this issue - if I have time, I will send a PR from my personal GitGub account (this one).