b234361 created the issue

When resuming downloads, the transfer rate (and accordingly, the remaining time estimate) is calculated incorrectly. For example:

Assume 10MB file.

5MB was previously downloaded.

DL is resumed.

At first, the tx rate is astronomically high and the estimated remaining time shows just a few seconds. It looks like the rate/time calculation is thinking that the first 5MB were downloaded instantaneously.

Suppose it takes 1 minute to DL the next 1MB. Now perhaps the rate would show 102.4KB/s (i.e. 6MB in 1 minute) and estimate less than 1 minute left (to DL the remaining 4MB) when in fact the rate has been 17KB/s (1MB in 1 minute) and it should be 4 minutes remaining.

In other words, I think the calculation is taking into account the previously-downloaded portion, which throws things off. It would be much more helpful if only the size remaining of the file since "resume" were taken into account - then we could have more accurate time (and transfer rate) estimates.