Files with same name can't be told apart

[aerkiaga]

 * Xed 3.2.2
 * Linux Mint 20.3

Issue
Files having the same name while on different paths appear the same. This is a problem, for example, when editing Rust Cargo projects, which can have tons of files named simply main.rs, lib.rs, mod.rs and Cargo.toml.

Steps to reproduce
Create two homonimous files in separate directories, then open both using Xed.

Expected behaviour
Xed should somehow make it clear which file is which. This doesn't need to be overly complicated as in #31. For example, when two files have the same name, some other editors display one or more trailing components of their path in the same tab, in a way that allows for easy visual grepping (e.g. cursive, different color, simply separated with a tilde or some other symbol...).

Other information
Behavior in other software:
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