Do not copy 'visible' property for WMTS layers

contribs/gmf/src/layertree/SyncLayertreeMap.js

@@ -403,7 +403,7 @@ SyncLayertreeMap.prototype.createWMTSLayer_ = function(gmfLayerWMTS) {
     minResolution,
     maxResolution
   ).then((layer) => {
-    newLayer.setProperties(layer.getProperties());
+    this.layerHelper_.copyProperties(layer, newLayer, ['visible']);
   });
   return newLayer;
 };

contribs/gmf/src/permalink/Permalink.js

@@ -1342,6 +1342,16 @@ PermalinkService.prototype.initLayers_ = function() {
             }
             this.gmfLayerBeingSwipe_.layer = treeCtrl.layer;
           }
+
+          if (
+            treeCtrl.layer.getLayers &&
+            treeCtrl.layer.getLayers().item(0) &&
+            treeCtrl.layer.getLayers().item(0).get('layerNodeName') === 'ch.are.alpenkonvention'
+          ) {
+            treeCtrl.layer.getLayers().item(0).on('change:visible', (e) => {
+              console.log(e);
+            });
+          }
         }
 
         if (treeCtrl.parent.node && parentGroupNode.mixed && groupNode.children == undefined) {

src/map/LayerHelper.js

@@ -62,6 +62,36 @@ const GROUP_KEY = 'groupName';
 const REFRESH_PARAM = 'random';
 
 
+/**
+ * Copy each properties from a layer onto an other layer, with the
+ * option to exclude specific ones.
+ *
+ * @param {import("ol/layer/Layer.js").default} layerFrom The layer
+ *     from which to copy the properties.
+ * @param {import("ol/layer/Layer.js").default} layerTo The layer onto
+ *     which the properties are copied.
+ * @param {string[]=} opt_excludes A list of properties that should
+ *     not be copied.
+ */
+LayerHelper.prototype.copyProperties = function(
+  layerFrom, layerTo, opt_excludes
+) {
+  const properties = layerFrom.getProperties();
+  if (opt_excludes) {
+    const excludes = opt_excludes;
+    const keys = Object.keys(properties);
+    for (const key of keys) {
+      if (excludes.includes(key)) {
+        continue;
+      }
+      layerTo.set(key, properties[key]);
+    }
+  } else {
+    layerTo.setProperties(properties);
+  }
+};
+
+
 /**
  * Create and return a basic WMS layer with only a source URL and a comma
  * separated layers names (see {@link import("ol/source/ImageWMS.js").default}).