Disambiguate buffer name

[Marcus Mu]

Right now, we're only taking the basename of the file. We can take a look at how vim-buftabline managed to disambiguate files with the same basename here.

So, ideally, we get something like this:

# | apple/index.txt | banana/index.txt |

[Bagrat Aznauryan]

This is a great idea and something I had in mind but never had time to work on. Thanks for creating this one and linking vim-buftabline example 👍