From 6c1a6b36840c0f9e944ec15977c23887eafdf9d4 Mon Sep 17 00:00:00 2001
From: Anant Jagania <anant.jagania@gmail.com>
Date: Wed, 4 Apr 2018 13:45:21 -0500
Subject: [PATCH] Add marker only if it doesn't exists in MarkerLayer

Issue #3
---
 .../java/org/vaadin/vol/client/MarkerLayerConnector.java    | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/v-ol2/src/main/java/org/vaadin/vol/client/MarkerLayerConnector.java b/v-ol2/src/main/java/org/vaadin/vol/client/MarkerLayerConnector.java
index 3d215cb..ee596be 100644
--- a/v-ol2/src/main/java/org/vaadin/vol/client/MarkerLayerConnector.java
+++ b/v-ol2/src/main/java/org/vaadin/vol/client/MarkerLayerConnector.java
@@ -28,9 +28,11 @@ public void onStateChanged(StateChangeEvent stateChangeEvent) {
     public void onConnectorHierarchyChange(ConnectorHierarchyChangeEvent event) {
         Profiler.enter("MarkerLayerConnector.onConnectorHierarchyChange");
         Profiler.enter("MarkerLayerConnector.onConnectorHierarchyChange add children");
-        int index = 0;
+
         for (ComponentConnector child : getChildComponents()) {
-            getWidget().addOrMove(child.getWidget(), index++);
+            if (!event.getOldChildren().contains(child)) {
+                getWidget().add(child.getWidget());
+            }
         }
         Profiler.leave("MarkerLayerConnector.onConnectorHierarchyChange add children");