Download progress swamps terminal on MinGW

[alexcrichton]

In a MinGW terminal I ran multirust update, and the new download progress counters look like they didn't correctly overwrite themselves so the output was just swamped with updates:

[crumblingstatue]

Related to #71 .

I'm not sure what's going on here. StdoutTerminal::carriage_return() should take care of resetting the cursor position to the beginning of the line, unless I'm either misinterpreting its function, or it's not working correctly on mingw terminals.

This should be less severe once #80 gets merged, as the information is printed only once per second. It would still be desirable for the line overwriting to work properly on mingw terminals though.

If someone has a mingw terminal and some time, investigating this would be appreciated.

Maybe we should use a different crate that provides proper functionality for writing to arbitrary locations in the terminal. I'm not aware of any complete cross-platform solutions to this, however.

[brson]

I believe this is fixed?

[Diggsey]

Yup, although until Stebalien/term#58 is fixed, there's no download progress at all.