feat: add a quick link to layer's permalink

This will open a new page with only this given layer shown.

umap/static/umap/js/modules/data/features.js

@@ -640,6 +640,12 @@ class Feature {
           window.open(permalink)
         },
       })
+      items.push({
+        label: translate('Layer permalink'),
+        action: () => {
+          window.open(this.datalayer.getPermalink())
+        },
+      })
     }
     items.push({
       label: translate('Copy as GeoJSON'),

umap/static/umap/js/modules/data/layer.js

@@ -1174,6 +1174,12 @@ export class DataLayer extends ServerStored {
     return this.options.name || translate('Untitled layer')
   }
 
+  getPermalink() {
+    return `${Utils.getBaseUrl()}?${Utils.buildQueryString({ datalayers: this.id })}${
+      window.location.hash
+    }`
+  }
+
   tableEdit() {
     if (!this.isVisible()) return
     const editor = new TableEditor(this._umap, this, this._leafletMap)