feat: show thumbhash behind load error, if possible

web/src/lib/components/asset-viewer/asset-viewer.svelte

@@ -595,14 +595,15 @@
       id="stack-slideshow"
       class="z-[1002] flex place-item-center place-content-center absolute bottom-0 w-full col-span-4 col-start-1 overflow-x-auto horizontal-scrollbar"
     >
-      <div class="relative w-full whitespace-nowrap">
+      <div class="relative w-full">
         {#each stackedAssets as stackedAsset (stackedAsset.id)}
           <div
             class={['inline-block px-1 relative transition-all pb-2']}
             style:bottom={stackedAsset.id === asset.id ? '0' : '-10px'}
           >
             <Thumbnail
               imageClass={{ 'border-2 border-white': stackedAsset.id === asset.id }}
+              brokenAssetClass="text-xs"
               dimmed={stackedAsset.id !== asset.id}
               asset={stackedAsset}
               onClick={(stackedAsset) => {

web/src/lib/components/asset-viewer/photo-viewer.svelte

@@ -184,7 +184,9 @@
   ]}
 />
 {#if imageError}
-  <BrokenAsset class="text-xl" />
+  <div class="h-full w-full">
+    <BrokenAsset class="text-xl h-full w-full" />
+  </div>
 {/if}
 <!-- svelte-ignore a11y_missing_attribute -->
 <img bind:this={loader} style="display:none" src={imageLoaderUrl} aria-hidden="true" />

web/src/lib/components/assets/broken-asset.svelte

@@ -14,7 +14,7 @@
 </script>
 
 <div
-  class="flex flex-col overflow-hidden max-h-full max-w-full justify-center items-center bg-gray-100 dark:bg-gray-700 dark:text-gray-100 p-4 {className}"
+  class="flex flex-col overflow-hidden max-h-full max-w-full justify-center items-center bg-gray-100/40 dark:bg-gray-700/40 dark:text-gray-100 p-4 {className}"
   style:width
   style:height
 >

web/src/lib/components/assets/thumbnail/image-thumbnail.svelte

@@ -21,7 +21,8 @@
     border?: boolean;
     hiddenIconClass?: string;
     class?: ClassValue;
-    onComplete?: (() => void) | undefined;
+    brokenAssetClass?: ClassValue;
+    onComplete?: ((errored: boolean) => void) | undefined;
   }
 
   let {
@@ -39,6 +40,7 @@
     hiddenIconClass = 'text-white',
     onComplete = undefined,
     class: imageClass = '',
+    brokenAssetClass = '',
   }: Props = $props();
 
   let {
@@ -50,17 +52,17 @@
 
   const setLoaded = () => {
     loaded = true;
-    onComplete?.();
+    onComplete?.(false);
   };
   const setErrored = () => {
     errored = true;
-    onComplete?.();
+    onComplete?.(true);
   };
 
   function mount(elem: HTMLImageElement) {
     if (elem.complete) {
       loaded = true;
-      onComplete?.();
+      onComplete?.(false);
     }
   }
 
@@ -71,6 +73,7 @@
       shadow && 'shadow-lg',
       (circle || !heightStyle) && 'aspect-square',
       border && 'border-[3px] border-immich-dark-primary/80 hover:border-immich-primary',
+      brokenAssetClass,
     ]
       .filter(Boolean)
       .join(' '),

web/src/lib/components/assets/thumbnail/thumbnail.svelte

@@ -40,6 +40,7 @@
     showArchiveIcon?: boolean;
     showStackedIcon?: boolean;
     imageClass?: ClassValue;
+    brokenAssetClass?: ClassValue;
     dimmed?: boolean;
     onClick?: ((asset: AssetResponseDto) => void) | undefined;
     onSelect?: ((asset: AssetResponseDto) => void) | undefined;
@@ -66,6 +67,7 @@
     onMouseEvent = undefined,
     handleFocus = undefined,
     imageClass = '',
+    brokenAssetClass = '',
     dimmed = false,
   }: Props = $props();
 
@@ -77,6 +79,7 @@
   let focussableElement: HTMLElement | undefined = $state();
   let mouseOver = $state(false);
   let loaded = $state(false);
+  let thumbError = $state(false);
 
   $effect(() => {
     if (focussed && document.activeElement !== focussableElement) {
@@ -153,10 +156,10 @@
   style:width="{width}px"
   style:height="{height}px"
 >
-  {#if !loaded && asset.thumbhash}
+  {#if (!loaded || thumbError) && asset.thumbhash}
     <canvas
       use:thumbhash={{ base64ThumbHash: asset.thumbhash }}
-      class="absolute object-cover z-10"
+      class="absolute object-cover"
       style:width="{width}px"
       style:height="{height}px"
       out:fade={{ duration: THUMBHASH_FADE_DURATION }}
@@ -296,12 +299,13 @@
       </div>
       <ImageThumbnail
         class={imageClass}
+        {brokenAssetClass}
         url={getAssetThumbnailUrl({ id: asset.id, size: AssetMediaSize.Thumbnail, cacheKey: asset.thumbhash })}
         altText={$getAltText(asset)}
         widthStyle="{width}px"
         heightStyle="{height}px"
         curve={selected}
-        onComplete={() => (loaded = true)}
+        onComplete={(errored) => ((loaded = true), (thumbError = errored))}
       />
       {#if asset.type === AssetTypeEnum.Video}
         <div class="absolute top-0 h-full w-full">