multiple runtime bugfixes for 1.5.5+65

lib/view/pages/files/sharing/sharee_picker_page.dart

@@ -4,10 +4,10 @@ import '../../../../api/errors/error_mapper.dart';
 import '../../../../api/marianumcloud/autocomplete/autocomplete_api.dart';
 import '../../../../api/marianumcloud/autocomplete/autocomplete_response.dart';
 import '../../../../api/marianumcloud/files_sharing/queries/share/share.dart';
-import '../../../../model/endpoint_data.dart';
 import '../../../../utils/debouncer.dart';
 import '../../../../utils/haptics.dart';
 import '../../../../widget/app_progress_indicator.dart';
+import '../../../../widget/user_avatar.dart';
 
 /// Result of [ShareePickerPage]: a recipient to create a share for.
 class ShareeRef {
@@ -209,16 +209,11 @@ class _ShareePickerPageState extends State<ShareePickerPage> {
 
   Widget _resultTile(AutocompleteResponseObject object) {
     final isGroup = shareTypeFromSource(object.source) == kShareTypeGroup;
+    // Nextcloud groups are not Talk rooms, so UserAvatar's group URL does not
+    // apply to them — they keep a plain icon.
     final leading = isGroup
         ? const CircleAvatar(child: Icon(Icons.groups_outlined))
-        : CircleAvatar(
-            foregroundImage: Image.network(
-              'https://${EndpointData().nextcloud().full()}/avatar/${object.id}/128',
-            ).image,
-            backgroundColor: Theme.of(context).primaryColor,
-            foregroundColor: Colors.white,
-            child: const Icon(Icons.person),
-          );
+        : UserAvatar(id: object.id, semanticLabel: object.label);
     return ListTile(
       leading: leading,
       title: Text(object.label),