Bad mitering produced by Clipper2

[andersmelander]

It looks as if the miter isn't properly applied when the "inner" edge of a segment intersect the "outer" edge of the other segment:

Originally posted by @andersmelander in #276 (comment)

[andersmelander]

Test case:

var PolyPoints: TArrayOfArrayOfFloatPoint := [ GR32_VectorUtils.BuildPolygonF([
      50, 50,
      200, 60,
      50, 70
    ]) ];

PolyPoints := GR32_Clipper.InflatePaths(PolyPoints, 20, jtMiter, etOpenButt, 4);

Note: The problem only occurs for PolyPoints[0][1].X >= 200.

[andersmelander]

@AngusJohnson Thanks. I'll queue the fix for integration.