Extra arrows on leader lines

[theoryshaw]

As outlined:
https://community.osarch.org/discussion/1945/

Can't find a way to replicate, but happens relatively frequently.

[Moult]

This only happens in the SVG, right? Can you share a problematic SVG?

[theoryshaw]

I think it happens in BB--that is, extra vertices get added for some reason.

As a random example. if you try and print FLOOR PLAN - ROOF on the following file, there's a few examples.
https://hub.openingdesign.com/OpeningDesign/Highland_Haven/src/commit/f7b97cef762a76d16684e1df52b4a510731d038b/Open/Models_and_CAD/BlenderBIM/Highland_Haven.ifc

[Moult]

@aothms is this perhaps related to #887 ?

import ifcopenshell
import ifcopenshell.geom
import ifcopenshell.util.shape

ifc_file = ifcopenshell.open('./Highland_Haven.ifc')
element = ifc_file.by_id(4540642)
for e in ifc_file.traverse(element):
    print(e)

settings = ifcopenshell.geom.settings()
settings.set(settings.INCLUDE_CURVES, True)
settings.set(settings.WELD_VERTICES, True)
shape = ifcopenshell.geom.create_shape(settings, element)

geometry = shape

verts = geometry.verts
print(verts)

edges = geometry.edges
print(edges)

faces = geometry.faces
print(faces)

This outputs:

#4540642=IfcGeometricCurveSet((#4540641))
#4540641=IfcIndexedPolyCurve(#4540640,$,$)
#4540640=IfcCartesianPointList2D(((1.01334154605865,0.503362596035004),(0.0456077717244625,0.503362596035004),(-6.31875371932983,2.5830409526825)))
(0.3088665032386765, 0.15342491927146923, 0.0, 0.013901248821616197, 0.15342491927146923, 0.0, 0.01390124882161617, 0.15342491927146923, 0.0, -1.9259561336517323, 0.787310882377626, 0.0)
(0, 1, 2, 3)
()

i.e. the polycurve should only have 3 verts, but 4 verts are returned. Shouldn't the polycurve remain chained somehow?