Improvements on the progress bar
As I've seen when wget2 continues a download with the progress bar enabled the progress starts at 0 Bytes and 0% completed of the part of the file that wasn't downloaded previously, but the user is not warned about this (which IMO may be confusing). I think it would be better that the progress bar reflects the real point on the download (size already retrieved and percentage)
And by the way, I don't understand what the docs means by The "bar" indicator is used by default
. Where is it used by default?