automatic title update when changing focused directory

[evanescente-ondine]

Hi, I have a request for the possibility of updating the title automatically, whenever the focused directory (not "working" directory) change, which include all uses of ":focus" or when switching from one panel to another (assuming different focuses). Dystroy came up with this code, using escape sequences, but it's both limited (no multi-panel support) and according himself, of questionable reliability depending on terminal emulators.

{
    invocation: title
    external: ["echo", "-en", "\\033]0;{file-name}\\a"]
    leave_broot: false
}
{
    invocation: focus_and_title
    key: enter
    cmd: ":focus;:title"
    apply_to: directory
    leave_broot: false
}

So a hard-wired solution would be much appreciated, for I'm certain other people have a heavy use of tiling window manager and don't find the constant "foot" or "xterm" or "~" very helpful.
Thanks :-)