From 6a08c28dcaad0d1f85b807d3191d128bf85c14d5 Mon Sep 17 00:00:00 2001
From: Pieter Vander Vennet <pietervdvn@posteo.net>
Date: Mon, 25 Mar 2024 03:45:24 +0100
Subject: [PATCH] Improve feedback on backroundlayer.id

---
 src/Models/ThemeConfig/Conversion/Validation.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Models/ThemeConfig/Conversion/Validation.ts b/src/Models/ThemeConfig/Conversion/Validation.ts
index 471f8aa92..d13afe8b0 100644
--- a/src/Models/ThemeConfig/Conversion/Validation.ts
+++ b/src/Models/ThemeConfig/Conversion/Validation.ts
@@ -277,9 +277,11 @@ export class ValidateTheme extends DesugaringStep<LayoutConfigJson> {
                 backgroundId === "photo" || backgroundId === "map" || backgroundId === "osmbasedmap"
 
             if (!isCategory && !ValidateTheme._availableLayers.has(backgroundId)) {
+                const options = Array.from(ValidateTheme._availableLayers)
+                const nearby = Utils.sortedByLevenshteinDistance(backgroundId, options, t => t)
                 context
                     .enter("defaultBackgroundId")
-                    .err("This layer ID is not known: " + backgroundId)
+                    .err(`This layer ID is not known: ${backgroundId}. Perhaps you meant one of ${nearby.slice(0,5).join(", ")}`)
             }
         }