Display tags in horizontal mode

[nicoespeon]

Tags are currently not rendered in horizontal mode. It could be a nice info to have though.

But I'm not quite sure what it should look like. Horizontal mode is challenging.

I'm open to suggestions on this one 👐

[nicoespeon]

I'm thinking about that kind of rendering (as suggested in #173):

But that might imply to change how branch labels are rendered.

[thomasfourest]

I like it. it will be a great "must-have" !