ExtensionLine / DimensionLine complain that start > end

[jdegenstein]

This code is adapted from docs/objects_2d.py:

std = Draft()

# [ExtensionLine]
with BuildSketch() as e_line:
    with BuildLine():
        l1 = Polyline((20, 40), (-40, 40), (-40, -40), (20, -40))
        RadiusArc(l1 @ 0, l1 @ 1, 50)
    make_face()
    edg = e_line.edges().sort_by(Axis.X)[0]
    ExtensionLine(border=edg, offset=10, draft=std)
    outside_curve = e_line.edges().sort_by(Axis.X)[-1]
    ExtensionLine(border=outside_curve, offset=10, label_angle=True, draft=std)

# [TechnicalDrawing]
with BuildSketch() as tech_drawing:
    with Locations((0, 20)):
        add(e_line)
    TechnicalDrawing()

Returns:

ValueError                                Traceback (most recent call last)
     24     ExtensionLine(border=edg, offset=10, draft=std)
     25     outside_curve = e_line.edges().sort_by(Axis.X)[-1]
---> 26     ExtensionLine(border=outside_curve, offset=10, label_angle=True, draft=std)
     28 # [TechnicalDrawing]
     29 with BuildSketch() as tech_drawing:

File c:\Users\someuser\.conda\envs\ocp_vscode\Lib\site-packages\build123d\drafting.py:562, in ExtensionLine.__init__(self, border, offset, draft, sketch, label, arrows, tolerance, label_angle, project_line, mode)
    560     e_line_shape = sweep(line_pen, extension_line, mode=Mode.PRIVATE)
    561     e_lines.append(e_line_shape)
--> 562 d_line = DimensionLine(
    563     dimension_path,
    564     draft,
    565     sketch,
    566     label,
    567     arrows,
    568     tolerance,
    569     label_angle,
    570     mode=Mode.PRIVATE,
    571 )
    572 self.dimension = d_line.dimension  #: length of the dimension
    574 e_line_sketch = Sketch(children=e_lines + d_line.faces())

File c:\Users\someuser\.conda\envs\ocp_vscode\Lib\site-packages\build123d\drafting.py:410, in DimensionLine.__init__(self, path, draft, sketch, label, arrows, tolerance, label_angle, mode)
    406 if label_length + arrows.count(True) * draft.arrow_length < path_length:
    407     shaft_length = (path_length - label_length) / 2 - draft.pad_around_text
    408     shaft_pair = [
    409         path_obj.trim(0.0, shaft_length / path_length),
--> 410         path_obj.trim(1.0 - shaft_length / path_length, 1.0),
    411     ]
    412 else:
    413     shaft_length = 2 * draft.arrow_length

File c:\Users\someuser\.conda\envs\ocp_vscode\Lib\site-packages\build123d\topology.py:7785, in Wire.trim(self, start, end)
   7783     u_start = edge.param_at_point(trim_start_point)
   7784     u_end = edge.param_at_point(trim_end_point)
-> 7785     edge = edge.trim(u_start, u_end)
   7786 elif contains_start:
   7787     u_value = edge.param_at_point(trim_start_point)

File c:\Users\someuser\.conda\envs\ocp_vscode\Lib\site-packages\build123d\topology.py:4609, in Edge.trim(self, start, end)
   4594 """trim
   4595 
   4596 Create a new edge by keeping only the section between start and end.
   (...)
   4606     Edge: trimmed edge
   4607 """
   4608 if start >= end:
-> 4609     raise ValueError(f"start ({start}) must be less than end ({end})")
   4611 new_curve = BRep_Tool.Curve_s(
   4612     copy.deepcopy(self).wrapped, self.param_at(0), self.param_at(1)
   4613 )
   4614 parm_start = self.param_at(start)

ValueError: start (0.8165271836783728) must be less than end (0.0)

I have also observed some non-repeatable sporadic behavior in which this fails on the first call to ExtensionLine (in the same way as above). Perhaps the line is reversed at some point?