🐛 Fix wrong index displays in thumbnail preview mode

Author: AlexV525

CHANGELOG.md

@@ -6,7 +6,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## 5.1.2
 
-- Fix selected assets unsynced between thumb preview mode and grid view.
+- Fix selected assets not sync between thumbnail preview mode and grid view.
+- Fix wrong index displays in thumbnail preview mode.
 
 ## 5.1.1
 

lib/src/delegates/asset_picker_viewer_builder_delegate.dart

@@ -661,7 +661,7 @@ class DefaultAssetPickerViewerBuilderDelegate
           child: Center(
             child: isSelected
                 ? Text(
-                    (currentIndex + 1).toString(),
+                    '${selectedAssets!.indexOf(asset) + 1}',
                     style: const TextStyle(
                       fontSize: 16.0,
                       fontWeight: FontWeight.bold,