feat: add {layer} as popup variable (aka extended properties)

fix #2007

umap/static/umap/js/umap.features.js

@@ -602,6 +602,7 @@ U.FeatureMixin = {
     if (locale) properties.locale = locale
     if (L.lang) properties.lang = L.lang
     properties.rank = this.getRank() + 1
+    properties.layer = this.datalayer.getName()
     if (this._map && this.hasGeom()) {
       center = this.getCenter()
       properties.lat = center.lat

umap/tests/integration/test_view_marker.py

@@ -79,3 +79,28 @@ def test_should_open_popup_panel_on_click(live_server, map, page, bootstrap):
     # Close popup
     page.locator("#map").click()
     expect(panel).to_be_hidden()
+
+
+def test_extended_properties_in_popup(live_server, map, page, bootstrap):
+    map.settings["properties"]["popupContentTemplate"] = """
+    Rank: {rank}
+    Locale: {locale}
+    Lang: {lang}
+    Lat: {lat}
+    Lon: {lon}
+    Zoom: {zoom}
+    Layer: {layer}
+    """
+    map.save()
+    page.goto(f"{live_server.url}{map.get_absolute_url()}")
+    expect(page.locator(".umap-icon-active")).to_be_hidden()
+    page.locator(".leaflet-marker-icon").click()
+    expect(page.locator(".umap-icon-active")).to_be_visible()
+    expect(page.locator(".leaflet-popup-content-wrapper")).to_be_visible()
+    expect(page.get_by_text("Rank: 1")).to_be_visible()
+    expect(page.get_by_text("Locale: en")).to_be_visible()
+    expect(page.get_by_text("Lang: en")).to_be_visible()
+    expect(page.get_by_text("Lat: 48.5529")).to_be_visible()
+    expect(page.get_by_text("Lon: 14.6889")).to_be_visible()
+    expect(page.get_by_text("Zoom: 7")).to_be_visible()
+    expect(page.get_by_text("Layer: test datalayer")).to_be_visible()