Fix: don't crash if an unselected element is selected (by not selecting it)

src/Models/ThemeViewState/WithSelectedElementState.ts

@@ -32,11 +32,13 @@ export class WithSelectedElementState extends UserMapFeatureswitchState {
             if (lastClick.mode !== "left") {
                 return
             }
-            this.setSelectedElement(lastClick.nearestFeature)
+            const nearestFeature = lastClick.nearestFeature
+            this.setSelectedElement(nearestFeature)
         })
 
         // Add the selected element to the recently visited history
         this.selectedElement.addCallbackD((selected) => {
+            console.trace("Selected element is", selected)
             const [osm_type, osm_id] = selected.properties.id.split("/")
             const [lon, lat] = GeoOperations.centerpointCoordinates(selected)
             const layer = this.theme.getMatchingLayer(selected.properties)
@@ -65,12 +67,21 @@ export class WithSelectedElementState extends UserMapFeatureswitchState {
     }
 
     protected setSelectedElement(feature: Feature) {
+        if (!feature) {
+            this.selectedElement.setData(undefined)
+            return
+        }
+        const layer = this.theme.getMatchingLayer(feature?.properties)
+        if (layer?.title === undefined) {
+            console.log("Not selecting feature", feature, ": no title (or no matching layer) found, unselectable element")
+            return
+        }
+
         const current = this.selectedElement.data
         if (
             current?.properties?.id !== undefined &&
             current.properties.id === feature?.properties?.id
         ) {
-            console.log("Not setting selected, same id", current, feature)
             return // already set
         }
         this.selectedElement.setData(feature)

src/UI/BigComponents/SelectedElementTitle.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
   import type { Feature } from "geojson"
-  import { ImmutableStore, Store, UIEventSource } from "../../Logic/UIEventSource"
+  import { Store, UIEventSource } from "../../Logic/UIEventSource"
   import LayerConfig from "../../Models/ThemeConfig/LayerConfig"
   import type { SpecialVisualizationState } from "../SpecialVisualization"
   import TagRenderingAnswer from "../Popup/TagRendering/TagRenderingAnswer.svelte"
@@ -35,7 +35,9 @@
         <!-- Title element and  title icons-->
         <h3 class="m-0">
           <a href={`#${$tags.id}`}>
+            {#if layer.title}
             <TagRenderingAnswer config={layer.title} {selectedElement} {state} {tags} {layer} />
+            {/if}
           </a>
         </h3>
         <div