Proposed changes to empty command handling in JDB

[Jakob Cornell]

Well I let this thread go quiet for a few weeks, but I did want to follow up on the new input we got in August.  It sounds like multiple people are concerned about the cost of reviewing a change to JDB that implements GDB's empty command handling, but a patch that adds Jline line editing and history would be worth considering.

I think I'll start looking into that change, and if I'm able to prepare a patch we can have some people take a look.  If it's too much to merge then I suppose I could keep it in a fork and benefit from the work myself at least.  In the meantime, perhaps JBS 8271356 should be closed, since the community isn't interested in the change.  If so, somebody with access will need to do that.

Jakob