GitUp style graph with branches on x axis

[wmertens]

Is your feature request related to a problem? Please describe.

https://github.com/git-up/GitUp has a really cool graph where each unmerged branch is on the X axis, sorted by commit date of the head.

It's great to get an overview of the current status of a repository, even with really big/active projects

Describe the solution you'd like

So, for each unmerged branch, add a label at the top of the graph, and put its commits at the top.

Describe alternatives you've considered

GitUp is sadly macOS only, and while it's open source, it heavily uses the macOS-only graphics libraries.