Incorrect PolylineGeometry width

[pjcozzi]

I have a PolylineGeometry with three line segments (not a line strip). The first one is red; the second is green, and the third is blue. Only the blue one honors the line width. The others honor the width at their first point and then shrink at their last point.

It's easy to reproduce this in the pointgeometry branch with code like:

var origin = Cartographic.fromDegrees(4.0336146, 49.2532155);
var positionOnEllipsoid = ellipsoid.cartographicToCartesian(origin);
var modelMatrix = Transforms.eastNorthUpToFixedFrame(positionOnEllipsoid);

primitives.add(new DebugModelMatrixPrimitive({
  modelMatrix : modelMatrix,
  length : 100000.0,
  width : 10.0
}));

[mramato]

This also happens in the Set camera reference frame example and has for some time.

[mramato]

This still happens and was not related to #2136