fix(library): strictly enforce single folder photo filtering unless subfolder option is enabled

docker/frontend/src/Library.tsx

@@ -960,13 +960,33 @@ function Catalogue() {
     go(`/app?lib=${encodeURIComponent(photo.id)}`);
   }, [t]);
 
-  const rootName = node ? node.split('/')[0] : null;
+  const rootFolder = useMemo(() => {
+    if (!node) return folders[0] ?? null;
+    const normNode = (node || '').replace(/\\/g, '/');
+    return (
+      folders.find((f) => {
+        const normF = (f.name || '').replace(/\\/g, '/');
+        return normNode === normF || normNode.startsWith(`${normF}/`);
+      }) ?? folders[0] ?? null
+    );
+  }, [folders, node]);
+
+  const rootName = rootFolder ? rootFolder.name : null;
 
   // A row's folder as the walk spells it: '' for the picked folder itself, the
   // path under it for a subfolder, and nothing for a row belonging to another
   // folder — that one is not a folder of this roll.
-  const relOf = (key: string): string | null =>
-    !rootName ? null : key === rootName ? '' : key.startsWith(`${rootName}/`) ? `${key.slice(rootName.length + 1)}/` : null;
+  const relOf = useCallback(
+    (key: string): string | null => {
+      if (!rootName) return null;
+      const normRoot = normPath(rootName);
+      const normKey = normPath(key);
+      if (normKey === normRoot) return '';
+      if (normKey.startsWith(`${normRoot}/`)) return `${normKey.slice(normRoot.length + 1)}/`;
+      return null;
+    },
+    [rootName]
+  );
 
   // The tree: one row per picked folder, then one per subfolder, indented by its
   // depth — the folders the walk has named, whether or not a frame has been read
@@ -1089,20 +1109,22 @@ function Catalogue() {
   // it sits in, so the screen never opens on a node that is not drawn.
   useEffect(() => {
     if (!loaded || !node || nodes.some((n) => n.key === node)) return;
-    setNode(nodes.find((n) => n.key === node.split('/')[0])?.key ?? nodes[0]?.key ?? null);
-  }, [loaded, node, nodes]);
+    setNode(nodes.find((n) => n.key === rootName || n.key === normPath(rootName ?? ''))?.key ?? nodes[0]?.key ?? null);
+  }, [loaded, node, nodes, rootName]);
 
   // What the open node draws: its own frames, and — when the reader has asked
   // for the branch — the ones in every subfolder under it.
   const shown = useMemo(() => {
     if (!rootName) return photos;
-    const normRoot = rootName.replace(/\\/g, '/');
-    const normNode = (node ?? '').replace(/\\/g, '/');
+    const normRoot = normPath(rootName);
+    const normNode = normPath(node ?? '');
     const dir = normNode === normRoot ? '' : normNode.slice(normRoot.length + 1);
-    const below = dir === '' ? (p: LibraryPhoto) => (p.dir ?? '').replace(/\\/g, '/') !== '' : (p: LibraryPhoto) => (p.dir ?? '').replace(/\\/g, '/').startsWith(`${dir}/`);
+    const below = dir === ''
+      ? (p: LibraryPhoto) => normPath(p.dir ?? '') !== ''
+      : (p: LibraryPhoto) => normPath(p.dir ?? '').startsWith(`${dir}/`);
     return photos.filter((p) => {
-      const pFolder = (p.folder ?? '').replace(/\\/g, '/');
-      const pDir = (p.dir ?? '').replace(/\\/g, '/');
+      const pFolder = normPath(p.folder ?? '');
+      const pDir = normPath(p.dir ?? '');
       return pFolder === normRoot && (pDir === dir || (deep && below(p)));
     });
   }, [deep, node, photos, rootName]);