Path intersection leads to incorrect results in one direction, not the other

[kritzikratzi]

Hi!

I found an edge case of path intersection, where I get wrong results in one direction but not the other
.

This may or may not play together with these bugs:

• The Boolean operation result does not meet expectations. #2089
• Edge-case bugs in boolean operations #2082
• Incorrect subtraction result if paths are composed of quadratic bezier curves #1973

The example itself is quite minimal: Two shapes composed of bezier paths and lines, then look at p3=p2.intersect(p1) and p4=p1.intersect(p2).

var p1 = new Path("M 120 70 A 50 50 0 0 1 170 20 L 270 20 A 50 50 0 0 1 320 70 L 320 170 A 50 50 0 0 1 270 220 A 50 50 0 0 0 220 270 A 50 50 0 0 1 170 320 A 50 50 0 0 1 120 270 L 120 170 Z");
p1.fillColor = "rgba(255,0,0,0.5)";

var p2 = new Path("M 70 120 A 50 50 0 0 1 20 70 A 50 50 0 0 1 70 20 L 170 20 A 50 50 0 0 1 220 70 A 50 50 0 0 0 270 120 A 50 50 0 0 1 320 170 A 50 50 0 0 1 270 220 A 50 50 0 0 0 220 270 A 50 50 0 0 1 170 320 A 50 50 0 0 1 120 270 L 120 170 A 50 50 0 0 0 70 120 Z");
p2.fillColor = "rgba(0,255,0,0.5)";

var p3 = p2.intersect(p1);
p3.fillColor = "rgba(0,0,255,0.5)";
p3.position.x = 450;

var p4 = p1.intersect(p2);
p4.fillColor = "rgba(0,0,255,0.5)";
p4.position.x = 700;

//alert(project.exportSVG().outerHTML);
p2.position.y = 480;