Fix: fix #1779, add check to prevent similar errors

assets/themes/cyclofix/cyclofix.json

@@ -87,8 +87,7 @@
               "bicycle_rental!=docking_station"
             ]
           }
-        },
-        "name": null
+        }
       }
     },
     {
@@ -99,6 +98,7 @@
           "sameAs": "bicycle_rental_non_docking"
         },
         "minzoom": 18,
+        "name": null,
         "=pointRendering": [
           {
             "marker": [

src/Logic/ExtraFunctions.ts

@@ -275,12 +275,7 @@ class ClosestNObjectFunc implements ExtraFunction {
                 allFeatures.push([spec])
             }
         }
-        console.log(
-            "Determining features which are close to",
-            features,
-            "other features:",
-            allFeatures
-        )
+
         if (features === undefined) {
             return
         }

src/Models/ThemeConfig/Conversion/PrepareLayer.ts

@@ -1039,7 +1039,7 @@ class SetFullNodeDatabase extends DesugaringStep<LayerConfigJson> {
         if (!needsSpecial) {
             return json
         }
-        context.info("Layer " + json.id + " needs the fullNodeDatabase")
+        context.debug("Layer " + json.id + " needs the fullNodeDatabase")
         return { ...json, fullNodeDatabase: true }
     }
 }

src/Models/ThemeConfig/Conversion/PrepareTheme.ts

@@ -71,6 +71,7 @@ class SubstituteLayer extends Conversion<string | LayerConfigJson, LayerConfigJs
 
         for (const name of names) {
             const found = Utils.Clone(state.sharedLayers.get(name))
+            found["_basedOn"] = name
             if (found === undefined) {
                 reportNotFound(name)
                 continue
@@ -555,6 +556,31 @@ class WarnForUnsubstitutedLayersInTheme extends DesugaringStep<LayoutConfigJson>
     }
 }
 
+class PostvalidateTheme extends DesugaringStep<LayoutConfigJson> {
+    constructor() {
+        super("Various validation steps when everything is done", [], "PostvalidateTheme")
+    }
+
+    convert(json: LayoutConfigJson, context: ConversionContext): LayoutConfigJson {
+        for (const l of json.layers) {
+            const layer = <LayerConfigJson> l
+            const basedOn = <string> layer["_basedOn"]
+            if(!basedOn){
+                continue
+            }
+            if(layer["name"] === null){
+                continue
+            }
+            const sameBasedOn = <LayerConfigJson[]> json.layers.filter(l => l["_basedOn"] === layer["_basedOn"])
+            const minZoomAll = Math.min(...sameBasedOn.map(sbo => sbo.minzoom))
+            if(minZoomAll < layer.minzoom){
+                context.err("There are multiple layers based on "+basedOn+". The layer with id "+layer.id+" has a minzoom of "+layer.minzoom+", but has no name set. Another similar layer has a lower minzoom. As such, the layer selection might show 'zoom in to see features' even though some of the features are already visible. Set `\"name\": null` for this layer and eventually remove the 'name':null for the other layer.")
+            }
+        }
+
+        return json
+    }
+}
 export class PrepareTheme extends Fuse<LayoutConfigJson> {
     private state: DesugaringContext
 
@@ -583,7 +609,8 @@ export class PrepareTheme extends Fuse<LayoutConfigJson> {
                 ? new Pass("AddDefaultLayers is disabled due to the set flag")
                 : new AddDefaultLayers(state),
             new AddDependencyLayersToTheme(state),
-            new AddImportLayers()
+            new AddImportLayers(),
+            new PostvalidateTheme()
         )
         this.state = state
     }

src/Models/ThemeConfig/Json/LayoutConfigJson.ts

@@ -393,7 +393,7 @@ export interface LayoutConfigJson {
      *
      * This is especially useful for hiking maps, skiing maps etc...
      *
-     * funset: MapComplete default: don't use terrain
+     * ifunset: MapComplete default: don't use terrain
      * iftrue: Use elevation and render 3D
      * iffalse: Do not use terrain
      * group: advanced