See the stack trace after you click and scroll away

[fonsp]

This is one is more open-ended: when you click on a stack frame:

It takes you to the line, which is great, but now I lost the stack trace. And when I want to go back, I might not even know in which direction I got scrolled.

Three solutions:

1. "Take the stacktrace with you". This could be achieved with a more general "pin-the-output-of-this-cell" mechanism
2. Show code at the stack trace, so that you don't need to scroll.
3. ❓🌈💍

Feel free to experiment! As always, keep it simple, and before starting on a big PR, give us a call.