From c3db03d1e35ba327544524b93d1ed145e6cfffb3 Mon Sep 17 00:00:00 2001
From: Norbert Renner <norbert.renner@gmx.de>
Date: Fri, 11 Jun 2021 12:01:10 +0200
Subject: [PATCH] Keep ele when removing duplicates on concat

---
 js/control/Export.js | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/js/control/Export.js b/js/control/Export.js
index 5ec4a5e..54904b4 100644
--- a/js/control/Export.js
+++ b/js/control/Export.js
@@ -284,8 +284,15 @@ BR.Export._concatTotalTrack = function (segments) {
 
         let featureCoordinates = feature.geometry.coordinates;
         if (segmentIndex > 0) {
-            // remove first segment coordinate, same as previous last
-            featureCoordinates = featureCoordinates.slice(1);
+            // remove duplicate coordinate: first segment coordinate same as previous last,
+            // remove the one without ele value (e.g. beeline)
+            const prevLast = coordinates[coordinates.length - 1];
+            const first = featureCoordinates[0];
+            if (prevLast.length < first.length) {
+                coordinates.pop();
+            } else {
+                featureCoordinates = featureCoordinates.slice(1);
+            }
         }
         coordinates = coordinates.concat(featureCoordinates);
     }