Require that map layers are unique

2017-04-11 21:30:20 -06:00
parent d28f50465b
commit 64b3302883
2 changed files with 23 additions and 2 deletions
--- a/src/ol/layer/group.js
+++ b/src/ol/layer/group.js
@@ -54,14 +54,14 @@ ol.layer.Group = function(opt_options) {

  if (layers) {
    if (Array.isArray(layers)) {
-      layers = new ol.Collection(layers.slice());
+      layers = new ol.Collection(layers.slice(), {unique: true});
    } else {
      ol.asserts.assert(layers instanceof ol.Collection,
          43); // Expected `layers` to be an array or an `ol.Collection`
      layers = layers;
    }
  } else {
-    layers = new ol.Collection();
+    layers = new ol.Collection(undefined, {unique: true});
  }

  this.setLayers(layers);