Nicely handle direct manipulations when code is dirty

[brianhempel]

Right now any code changes are just discarded.

This could be a source of frustration.

Better options:

• If code is dirty and output side is clicked, run the dirty code first before doing anything.
• Do some fancy code diffing to apply the DM change to the dirty code.

[brianhempel]

This problem is mostly fixed with the newer autorun code changes, except that autorun sometimes crashes.