It is a very common pattern for craft tools to start the session directly on a host machine, but launch another craft instance to do the actual work inside LXD or Multipass. In order for a seamless CLI experience (which looks identical between a 'destructive build' on the host, LXD or Multipass), we need support for progress messages (ephemeral=True) to seamlessly cross the boundaries between the host and the container instance of of the craft tool. Please see examples.py #26 for an example. Add support for _Printer to respect ephemeral messages when stopping. On printer stop(), these messages are no longer terminated with a newline, but instead the printer will clear and reset the cursor to the start of the line. This behaviour change will allow subsequent terminal writes by a different process the ability to reuse a terminal line previously used as ephemeral output.