Split defaultDatalayer in defaultView/EditDatalayer

In view mode, we don't want the fallback to create a new datalayer.

umap/static/umap/js/umap.controls.js

@@ -1382,7 +1382,7 @@ L.U.Search = L.PhotonSearch.extend({
     })
     L.DomEvent.on(edit, 'mousedown', (e) => {
       L.DomEvent.stop(e)
-      const datalayer = self.map.defaultDataLayer()
+      const datalayer = self.map.defaultEditDataLayer()
       const layer = datalayer.geojsonToFeatures(feature)
       layer.isDirty = true
       layer.edit()
@@ -1636,7 +1636,7 @@ L.U.Editable = L.Editable.extend({
 
   connectCreatedToMap: function (layer) {
     // Overrided from Leaflet.Editable
-    const datalayer = this.map.defaultDataLayer()
+    const datalayer = this.map.defaultEditDataLayer()
     datalayer.addLayer(layer)
     layer.isDirty = true
     return layer

umap/static/umap/js/umap.js

@@ -694,8 +694,8 @@ L.U.Map.include({
           this._setDefaultCenter()
           return
         }
-        const datalayer = this.defaultDataLayer(),
+        const datalayer = this.defaultViewDataLayer(),
-          feature = datalayer.getFeatureByIndex(-1)
+          feature = datalayer ? datalayer.getFeatureByIndex(-1) : null
         if (feature) feature.zoomTo()
         else this._setDefaultCenter()
       })
@@ -1225,10 +1225,19 @@ L.U.Map.include({
     }
   },
 
+  defaultViewDataLayer: function () {
+    let datalayer, fallback
+    datalayer = this.findDataLayer((datalayer) => {
+      fallback = datalayer
+      if (datalayer.isVisible()) return true
+    })
+    return datalayer || fallback
+  },
+
   // TODO: allow to control the default datalayer
   // (edit and viewing)
   // cf https://github.com/umap-project/umap/issues/585
-  defaultDataLayer: function () {
+  defaultEditDataLayer: function () {
     let datalayer, fallback
     datalayer = this.lastUsedDataLayer
     if (

umap/tests/integration/test_map.py

@@ -1,4 +1,5 @@
 import json
+import re
 from pathlib import Path
 
 import pytest
@@ -11,6 +12,20 @@ from ..base import DataLayerFactory
 pytestmark = pytest.mark.django_db
 
 
+def test_default_view_latest_without_datalayer_should_use_default_center(
+    map, live_server, datalayer, page
+):
+    datalayer.settings["displayOnLoad"] = False
+    datalayer.save()
+    map.settings["defaultView"] = "latest"
+    map.save()
+    page.goto(f"{live_server.url}{map.get_absolute_url()}")
+    # Hash is defined, so map is initialized
+    expect(page).to_have_url(re.compile(".*#7/.*"))
+    layers = page.locator(".umap-browse-datalayers li")
+    expect(layers).to_have_count(1)
+
+
 def test_remote_layer_should_not_be_used_as_datalayer_for_created_features(
     map, live_server, datalayer, page
 ):