Imports are not persisted across breakpoints

[alt-romes]

If you import Module.Something into the debugger REPL while stopped at a breakpoint; stepping to the next breakpoint will lose that import and you're currently forced to import it again. That's very unergonomic.

The imports in the interactive session should be kept until the session is ended and persisted across breakpoints.

[Saizan]

We use setContext to append the imported module to the ones imported for InteractiveContext. Seems like they get dropped when we reach a new ExecBreak, probably by the code that sets up the new local scope?

GHCi does keep a separate list of the imports submitted at the repl, which then get used to setContext in bulk. Possibly for similar reasons.