FareySymbol fundamental_domain function cannot set thickness

[hooyuser]

Steps To Reproduce

• Open https://sagecell.sagemath.org/
• Type

  F = FareySymbol(Gamma(Integer(6))).fundamental_domain(ymax=2, thickness=0.1)
  F.set_aspect_ratio(1)
  F.save("test.pdf")

• Download test.pdf

Expected Behavior

The thickness of line for both hyperbolic_triangle and hyperbolic_arc are set to 0.1.

Actual Behavior

Only the thickness of line for hyperbolic_arc are set to 0.1. See the image below.

Additional Information

c.f. https://github.com/sagemath/sage/blob/develop/src/sage/modular/arithgroup/farey_symbol.pyx#L900 According to the source code, g.set_aspect_ratio(1) means aspect ratio should be set to 1 by default. However, I found print(F.aspect_ratio()) gives result automatic. And I have to set it manually by F.set_aspect_ratio(1) to get the correct aspect ratio.

Environment

• OS: Windows WSL
• Sage Version: 10.4

Checklist

• [X] I have searched the existing issues for a bug report that matches the one I want to file, without success.
• [X] I have read the documentation and troubleshoot guide

[hgranath]

Would it help to add the keyword argument thickness=options['thickness'] to these lines?