From cb35873e29f6f2cc1a92d82d3189d23c63aafeb1 Mon Sep 17 00:00:00 2001
From: Bryan Housel <bryan@mapbox.com>
Date: Thu, 12 Jan 2017 20:08:42 +0530
Subject: [PATCH] Don't allow continue from the connecting vertex of a closed
 way

Now that addNode tries to preserve circularity, this
could cause the continued segment to loop back.

And anyway it's confusing why one vertex allows it and none others do.
---
 modules/operations/continue.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/modules/operations/continue.js b/modules/operations/continue.js
index 4feaab5ef..5d24f463a 100644
--- a/modules/operations/continue.js
+++ b/modules/operations/continue.js
@@ -15,6 +15,7 @@ export function operationContinue(selectedIDs, context) {
     function candidateWays() {
         return graph.parentWays(vertex).filter(function(parent) {
             return parent.geometry(graph) === 'line' &&
+                !parent.isClosed() &&
                 parent.affix(vertex.id) &&
                 (geometries.line.length === 0 || geometries.line[0] === parent);
         });