Print stacktrace link in REPL gets duplicated

[jacobemcken]

How to reproduce:

1. Create empty Clojure project lein new calvabug
2. Open VS Code and start REPL: Calva: Start a Project REPL and Connect
3. Trigger any exception e.g. with (/ 4 0)
4. Close the REPL buffer by clicking the little x or pressing Ctrl+w
5. Start REPL again: Calva: Start a Project REPL and Connect
6. Trigger exception again

Expected behavior:
Show "Print stacktrace" a single time.

What actually happens:
The "Print stacktrace" is shown as many times as the REPL was (re-)started.

[PEZ]

I have been wondering about this. I vaguely remember someone speculating that it was about REPL restarts. Should be easy to fix if this is what it is about.