Local repository needs to notify proxied repo of ireq copying

[richafrank]

Otherwise, the proxied repository loses track of what dependencies
the copy has. The local repo is used to prefer versions from an
existing requirements file.

Fixes #1154.
Fixes #1155.

Changelog-friendly one-liner: Fixed copying of dependencies when requirements are combined and there is an existing requirements file.

Contributor checklist

• Provided the tests for the changes.
• Gave a clear one-line description in the PR (that the maintainers can add to CHANGELOG.md on release).
• Assign the PR to an existing or new milestone for the target version (following Semantic Versioning).

[codecov]

Codecov Report

Merging #1159 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1159   +/-   ##
=======================================
  Coverage   99.50%   99.50%           
=======================================
  Files          36       36           
  Lines        2802     2836   +34     
  Branches      331      332    +1     
=======================================
+ Hits         2788     2822   +34     
  Misses          8        8           
  Partials        6        6           

Impacted Files	Coverage Δ
piptools/repositories/base.py	100.00% <100.00%> (ø)
piptools/repositories/local.py	96.36% <100.00%> (+0.13%)	⬆️
tests/conftest.py	100.00% <100.00%> (ø)
tests/test_cli_compile.py	100.00% <100.00%> (ø)
tests/test_repository_local.py	100.00% <100.00%> (ø)

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[richafrank]

Let me know if you think more of an integration test is worthwhile.

[atugushev]

Thanks for fixing this! Could we have an integration test for this regression?

[richafrank]

@atugushev 👍 Added

[atugushev]

Thanks for the tests! I would use make_package fixture though instead of using existing wheels (to isolate tests), but we could do it in following up PR.