- Properly update line numbers in the backtrace data structure all the time, not just when we're entering a context (so if one stops in the middle of something, the lines are actually correct)

- Make the callstack display actually usable, and let is jump around the code.
It doesn't change the context for the variable display. Maybe it should. Maybe it shouldn't. Not sure. But it sounds too much like a feature, so at this point I'll take "no" as the answer.