From 632eb25f19fbbe5b1aeb607b1badab181a5bdbb8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=BCrg=20Lehni?= <juerg@scratchdisk.com>
Date: Fri, 2 Oct 2015 18:57:45 -0500
Subject: [PATCH] Bring back code removed in
 11611c8fe2aa2001661c4ed43105d94c15905c7d again.

But add a _visited check, to get best of both approaches.
---
 src/path/PathItem.Boolean.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/path/PathItem.Boolean.js b/src/path/PathItem.Boolean.js
index 67df1943a0..b64c24a21b 100644
--- a/src/path/PathItem.Boolean.js
+++ b/src/path/PathItem.Boolean.js
@@ -680,7 +680,11 @@ PathItem.inject(new function() {
                     // switch at each crossing.
                     drawSegment(seg, other, 'exclude-cross', i, 'green');
                     seg = other;
-                } else if (isValid(other)) {
+                } else if (!seg._visited && isValid(seg)) {
+                    // Do not switch to the intersecting segment as this segment
+                    // is part of the the boolean result.
+                    drawSegment(seg, null, 'keep', i, 'black');
+                } else if (!other._visited && isValid(other)) {
                     // The other segment is part of the boolean result, and we
                     // are at crossing, switch over.
                     drawSegment(seg, other, 'cross', i, 'green');