- these commands. We should modify the protocol so that the library
- can hint at when progress messages would be useful (there's no point
- going to extra lengths to generate them if on the library side no
- one is registered to listen to them), and modify the daemon to try
- harder to generate them, even if they are only estimates. Also
- GtkProgressBar supports a "pulse mode" where it indicates activity
- with no time estimate, and we should try to support that as well.