extract --continue: skip complete dirs, count skipped files in --progress

[ThomasWaldmann]

Two small fixes for borg extract --continue, refs #6857.

Directories

same_item() already treats an existing directory with the archived mode and mtime as complete (b85ad47), but do_extract never passed continue_extraction when restoring directory metadata. As a result, every directory got chown/chmod/ACLs/xattrs/times set again. The result was still correct, just slower. Both directory metadata passes now pass the flag. The first pass, which creates directories, is unchanged.

A directory whose content was changed by this run gets a new mtime, so it still gets its metadata restored.

test_extract_continue checked only inode and mtime, which come out the same either way. It now also checks that dir1's ctime is unchanged.

--progress

The progress total includes the files that --continue skips, but their size was never added to the progress counter. The percentage therefore stayed far below the real one, e.g. 0% while extracting the last 10% of the data. Skipped files now advance the progress by their size.

New test: test_extract_continue_progress.

Both new assertions fail without the fix and pass with it. The --continue docs in the extract epilog now mention directories.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.12%. Comparing base (7e3d305) to head (10bbecb).
⚠️ Report is 7 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #10506   +/-   ##
=======================================
  Coverage   89.12%   89.12%           
=======================================
  Files         103      103           
  Lines       19783    19785    +2     
  Branches     3099     3100    +1     
=======================================
+ Hits        17631    17633    +2     
- Misses       1490     1492    +2     
+ Partials      662      660    -2     

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