improved performance and battery usage on older devices

lib/view/pages/files/search/files_search_results.dart

@@ -104,32 +104,43 @@ class FilesSearchResults extends StatelessWidget {
   Widget _resultList(BuildContext context, List<CacheableFile> combined) {
     final groups = _groupByParent(combined);
     final orderedKeys = groups.keys.toList()..sort();
-    final items = <Widget>[];
-    for (final folder in orderedKeys) {
-      final segments = _segmentsOf(folder);
-      items.add(
-        _FolderHeader(
-          folder: folder,
-          onOpen: () {
-            onResultTap?.call();
-            AppRoutes.openFolder(context, segments);
-          },
-        ),
-      );
-      for (final file in groups[folder]!) {
-        items.add(
-          FileElement(
-            file,
-            segments,
-            controller.retry,
-            highlight: controller.query,
-          ),
+    // Flat (folder header | file) rows built lazily: results can run into
+    // the hundreds and arrive in several batches per query.
+    final rows = <(String, CacheableFile?)>[
+      for (final folder in orderedKeys) ...[
+        (folder, null),
+        for (final file in groups[folder]!) (folder, file),
+      ],
+    ];
+    return ListView.builder(
+      padding: EdgeInsets.zero,
+      itemCount: rows.length,
+      itemBuilder: (context, index) {
+        final (folder, file) = rows[index];
+        final segments = _segmentsOf(folder);
+        if (file == null) {
+          return _FolderHeader(
+            key: ValueKey('folder:$folder'),
+            folder: folder,
+            onOpen: () {
+              onResultTap?.call();
+              AppRoutes.openFolder(context, segments);
+            },
+          );
+        }
+        return FileElement(
+          file,
+          segments,
+          controller.retry,
+          key: ValueKey('file:${file.path}'),
+          highlight: controller.query,
         );
-      }
-    }
-    return ListView(padding: EdgeInsets.zero, children: items);
+      },
+    );
   }
 
+  static final RegExp _edgeSlashes = RegExp(r'^/+|/+$');
+
   Map<String, List<CacheableFile>> _groupByParent(List<CacheableFile> files) {
     final map = <String, List<CacheableFile>>{};
     for (final file in files) {
@@ -139,7 +150,7 @@ class FilesSearchResults extends StatelessWidget {
   }
 
   String _parentOf(CacheableFile file) {
-    final stripped = file.path.replaceAll(RegExp(r'^/+|/+$'), '');
+    final stripped = file.path.replaceAll(_edgeSlashes, '');
     final segments = stripped.split('/');
     if (segments.length <= 1) return '/';
     segments.removeLast();
@@ -147,7 +158,7 @@ class FilesSearchResults extends StatelessWidget {
   }
 
   List<String> _segmentsOf(String folder) {
-    final stripped = folder.replaceAll(RegExp(r'^/+|/+$'), '');
+    final stripped = folder.replaceAll(_edgeSlashes, '');
     if (stripped.isEmpty) return const [];
     return stripped.split('/');
   }
@@ -156,7 +167,11 @@ class FilesSearchResults extends StatelessWidget {
 class _FolderHeader extends StatelessWidget {
   final String folder;
   final VoidCallback onOpen;
-  const _FolderHeader({required this.folder, required this.onOpen});
+  const _FolderHeader({
+    required this.folder,
+    required this.onOpen,
+    super.key,
+  });
 
   @override
   Widget build(BuildContext context) {