From a3512854c4bdb1663f22d57fadbf329bd29a9c6d Mon Sep 17 00:00:00 2001
From: fly <fly@acm-server.ru>
Date: Wed, 8 Jan 2014 02:53:58 +0400
Subject: [PATCH] Fixed: don't do calculations when layers are off

---
 plugins/fly-links.user.js | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/plugins/fly-links.user.js b/plugins/fly-links.user.js
index 59c8a2b4..584a3ab6 100644
--- a/plugins/fly-links.user.js
+++ b/plugins/fly-links.user.js
@@ -2,7 +2,7 @@
 // @id             fly-links@fly
 // @name           IITC plugin: Fly Links
 // @category       Layer
-// @version        0.2.0.@@DATETIMEVERSION@@
+// @version        0.2.1.@@DATETIMEVERSION@@
 // @updateURL      @@UPDATEURL@@
 // @downloadURL    @@DOWNLOADURL@@
 // @description    [@@BUILDNAME@@-@@BUILDDATE@@] Calculate how to link the portals to create the largest tidy set of nested fields. Enable from the layer chooser.
@@ -31,6 +31,10 @@ window.plugin.flyLinks.linksLayerGroup = null;
 window.plugin.flyLinks.fieldsLayerGroup = null;
 
 window.plugin.flyLinks.updateLayer = function() {
+  if (!window.map.hasLayer(window.plugin.flyLinks.linksLayerGroup) &&
+      !window.map.hasLayer(window.plugin.flyLinks.fieldsLayerGroup))
+    return;
+
   window.plugin.flyLinks.linksLayerGroup.clearLayers();
   window.plugin.flyLinks.fieldsLayerGroup.clearLayers();
   var ctrl = [$('.leaflet-control-layers-selector + span:contains("Fly links")').parent(), 
@@ -284,8 +288,8 @@ window.plugin.flyLinks.setup = function() {
     window.plugin.flyLinks.updateLayer();
   });
 
-  window.addLayerGroup('Fly links', window.plugin.flyLinks.linksLayerGroup, true);
-  window.addLayerGroup('Fly fields', window.plugin.flyLinks.fieldsLayerGroup, true);
+  window.addLayerGroup('Fly links', window.plugin.flyLinks.linksLayerGroup, false);
+  window.addLayerGroup('Fly fields', window.plugin.flyLinks.fieldsLayerGroup, false);
 }
 var setup = window.plugin.flyLinks.setup;