Fix average download speed (httpie#1516)

[mikurei]

Problem

When DownloadStatus is finished, it calls ProgressDisplay.stop(), which in turn calls ProgressDisplay._print_summary()

Here, in _print_summary(), we incorrectly assume that task.completed means observed steps, but in fact, when the download finishes, it is equal to task.total, which leads to issue with incorrect average download speed - no matter where we resume the download process, we always get task.total steps

Solution

• Extend the ProgressDisplay class by adding a resumed_at attribute to keep track of the progress that has already been done.
• Change the ProgressDisplay.stop() method to pass task.completed - self.resumed_at instead of task.completed

Related

Solves the issue #1516

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.26%. Comparing base (4d7d6b6) to head (939e774).
⚠️ Report is 383 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1518      +/-   ##
==========================================
- Coverage   97.28%   94.26%   -3.02%     
==========================================
  Files          67      113      +46     
  Lines        4235     7696    +3461     
==========================================
+ Hits         4120     7255    +3135     
- Misses        115      441     +326     

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