UX: translate 'creating point', indicate that a new background layer is loading in the selectBackgroundButton

src/UI/Map/StyleLoadingIndicator.svelte

@@ -6,14 +6,26 @@
 
   let isLoading = false
   export let map: UIEventSource<MlMap>
+  export let rasterLayer: UIEventSource<any> = undefined
+  
+  let didChange = undefined
+  onDestroy(rasterLayer?.addCallback(() => {
+    didChange = true
+  }) ??( () => {}))
+  
   onDestroy(Stores.Chronic(250).addCallback(
     () => {
-      isLoading = !map.data?.isStyleLoaded()
+      isLoading = !map.data?.isStyleLoaded() && (didChange === undefined || didChange)
+      if(didChange){
+        didChange = false
+      }
     },
   ))
 </script>
 
 
 {#if isLoading}
-  <Loading />
+  <Loading cls="h-6 w-6" />
+{:else}
+  <slot />
 {/if}