Use resolve_length in ShapeBuilder.rect

[darioackermann]

Provides a tiny fix to #555

Checklist:

• The GitHub pipeline is OK (green),
  meaning that both pylint (static code analyzer) and black (code formatter) are happy with the changes of this PR.

• A unit test is covering the code added / modified by this PR

• This PR is ready to be merged

• In case of a new feature, docstrings have been added, with also some documentation in the docs/ folder

• A mention of the change is present in CHANGELOG.md

By submitting this pull request, I confirm that my contribution is made under the terms of the GNU LGPL 3.0 license.

[Lucas-C]

Thank you for submitting a PR!
Would you mind adding a mention of this fix in CHANGELOG.md, and also a small unit test please?
You can just add an entry here: https://github.com/PyFPDF/fpdf2/blob/master/test/svg/parameters.py#L73

[darioackermann]

Added a Test and documented in Changelog. Should there any change be necessary, just let me know.

[Lucas-C]

Your PR is fine but the GitHub Actions pipeline is currently blocked by #559
I'll try to fix this asap and you'll just have to rebase your branch

[darioackermann]

Sure, no stress! I'll watch #559 and rebase accordingly

[Lucas-C]

The issue #559 is fixed now

[codecov]

Codecov Report

Base: 94.07% // Head: 94.07% // No change to project coverage 👍

Coverage data is based on head (cc94552) compared to base (cc94552).
Patch has no changes to coverable lines.

❗ Current head cc94552 differs from pull request most recent head 63cfbef. Consider uploading reports for the commit 63cfbef to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #558   +/-   ##
=======================================
  Coverage   94.07%   94.07%           
=======================================
  Files          21       21           
  Lines        6124     6124           
  Branches     1250     1250           
=======================================
  Hits         5761     5761           
  Misses        189      189           
  Partials      174      174           

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[Lucas-C]

I rebased and based your branch
Thank you @darioackermann!

[darioackermann]

Thanks for rebasing, I was a bit short of time today. You're welcome!