feature: add option to turn off auto-updating current block while scrolling in diff view with Block-Navigation enabled

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

src/Resources/Locales/en_US.axaml

@@ -559,6 +559,7 @@
   <x:String x:Key="Text.Preferences.General.ShowChildren" xml:space="preserve">Show children in the commit details</x:String>
   <x:String x:Key="Text.Preferences.General.ShowTagsInGraph" xml:space="preserve">Show tags in commit graph</x:String>
   <x:String x:Key="Text.Preferences.General.SubjectGuideLength" xml:space="preserve">Subject Guide Length</x:String>
+  <x:String x:Key="Text.Preferences.General.UpdateBlockNavigationOnScroll" xml:space="preserve">Update current block while scrolling in diff view (Block-Navigation)</x:String>
   <x:String x:Key="Text.Preferences.Git" xml:space="preserve">GIT</x:String>
   <x:String x:Key="Text.Preferences.Git.CRLF" xml:space="preserve">Enable Auto CRLF</x:String>
   <x:String x:Key="Text.Preferences.Git.DefaultCloneDir" xml:space="preserve">Default Clone Dir</x:String>

src/Resources/Locales/zh_CN.axaml

@@ -563,6 +563,7 @@
   <x:String x:Key="Text.Preferences.General.ShowChildren" xml:space="preserve">在提交详情页中显示子提交列表</x:String>
   <x:String x:Key="Text.Preferences.General.ShowTagsInGraph" xml:space="preserve">在提交路线图中显示标签</x:String>
   <x:String x:Key="Text.Preferences.General.SubjectGuideLength" xml:space="preserve">SUBJECT字数检测</x:String>
+  <x:String x:Key="Text.Preferences.General.UpdateBlockNavigationOnScroll" xml:space="preserve">启用基于变更块的跳转后，在变更对比页面滚动时更新当前高亮块</x:String>
   <x:String x:Key="Text.Preferences.Git" xml:space="preserve">GIT配置</x:String>
   <x:String x:Key="Text.Preferences.Git.CRLF" xml:space="preserve">自动换行转换</x:String>
   <x:String x:Key="Text.Preferences.Git.DefaultCloneDir" xml:space="preserve">默认克隆路径</x:String>

src/Resources/Locales/zh_TW.axaml

@@ -563,6 +563,7 @@
   <x:String x:Key="Text.Preferences.General.ShowChildren" xml:space="preserve">在提交詳細資訊中顯示後續提交</x:String>
   <x:String x:Key="Text.Preferences.General.ShowTagsInGraph" xml:space="preserve">在路線圖中顯示標籤</x:String>
   <x:String x:Key="Text.Preferences.General.SubjectGuideLength" xml:space="preserve">提交標題字數偵測</x:String>
+  <x:String x:Key="Text.Preferences.General.UpdateBlockNavigationOnScroll" xml:space="preserve">啟用「區塊切換變更」時，在變更對比檢視中捲動時更新目前反白的區塊</x:String>
   <x:String x:Key="Text.Preferences.Git" xml:space="preserve">Git 設定</x:String>
   <x:String x:Key="Text.Preferences.Git.CRLF" xml:space="preserve">自動換行轉換</x:String>
   <x:String x:Key="Text.Preferences.Git.DefaultCloneDir" xml:space="preserve">預設複製 (clone) 路徑</x:String>

src/ViewModels/BlockNavigation.cs

@@ -93,7 +93,7 @@ public Block GetCurrentBlock()
             if (_current >= 0 && _current < Blocks.Count)
                 return Blocks[_current];
 
-            return Blocks.Count > 0 ? Blocks[0] : null;
+            return null;
         }
 
         public Block GotoFirst()
@@ -142,15 +142,15 @@ public Block GotoLast()
             return Blocks[_current];
         }
 
-        public void AutoUpdate(int start, int end)
+        public bool AutoUpdate(int start, int end)
         {
             if (_current >= 0 && _current < Blocks.Count)
             {
                 var block = Blocks[_current];
                 if ((block.Start >= start && block.Start <= end) ||
                     (block.End >= start && block.End <= end) ||
                     (block.Start <= start && block.End >= end))
-                    return;
+                    return false;
             }
 
             for (var i = 0; i < Blocks.Count; i++)
@@ -162,9 +162,11 @@ public void AutoUpdate(int start, int end)
                 {
                     Current = i;
                     OnPropertyChanged(nameof(Indicator));
-                    return;
+                    return true;
                 }
             }
+
+            return false;
         }
 
         private int _current = -1;

src/ViewModels/Preferences.cs

@@ -261,6 +261,12 @@ public bool UseBlockNavigationInDiffView
             set => SetProperty(ref _useBlockNavigationInDiffView, value);
         }
 
+        public bool UpdateBlockNavigationOnScroll
+        {
+            get => _updateBlockNavigationOnScroll;
+            set => SetProperty(ref _updateBlockNavigationOnScroll, value);
+        }
+
         public int LFSImageActiveIdx
         {
             get => _lfsImageActiveIdx;
@@ -723,6 +729,7 @@ private bool RemoveInvalidRepositoriesRecursive(List<RepositoryNode> collection)
         private bool _showHiddenSymbolsInDiffView = false;
         private bool _useFullTextDiff = false;
         private bool _useBlockNavigationInDiffView = false;
+        private bool _updateBlockNavigationOnScroll = true;
         private int _lfsImageActiveIdx = 0;
         private bool _enableCompactFoldersInChangesTree = false;
 

src/Views/Preferences.axaml

@@ -46,7 +46,7 @@
           <TabItem.Header>
             <TextBlock Classes="tab_header" Text="{DynamicResource Text.Preferences.General}"/>
           </TabItem.Header>
-          <Grid Margin="8" RowDefinitions="32,32,32,32,32,32,32,32,Auto" ColumnDefinitions="Auto,*">
+          <Grid Margin="8" RowDefinitions="32,32,32,32,32,32,32,32,Auto,Auto" ColumnDefinitions="Auto,*">
             <TextBlock Grid.Row="0" Grid.Column="0"
                        Text="{DynamicResource Text.Preferences.General.Locale}"
                        HorizontalAlignment="Right"
@@ -148,6 +148,11 @@
                       IsChecked="{Binding ShowChildren, Mode=TwoWay}"/>
 
             <CheckBox Grid.Row="8" Grid.Column="1"
+                      Height="32"
+                      Content="{DynamicResource Text.Preferences.General.UpdateBlockNavigationOnScroll}"
+                      IsChecked="{Binding UpdateBlockNavigationOnScroll, Mode=TwoWay}"/>
+
+            <CheckBox Grid.Row="9" Grid.Column="1"
                       Height="32"
                       Content="{DynamicResource Text.Preferences.General.Check4UpdatesOnStartup}"
                       IsVisible="{x:Static s:App.IsCheckForUpdateCommandVisible}"

src/Views/TextDiffView.axaml.cs

@@ -825,7 +825,13 @@ private void OnTextViewVisualLinesChanged(object sender, EventArgs e)
             }
 
             ctx.DisplayRange = new ViewModels.TextDiffDisplayRange(start, start + count);
-            BlockNavigation?.AutoUpdate(start + 1, start + count);
+
+            if (ViewModels.Preferences.Instance.UpdateBlockNavigationOnScroll)
+            {
+                var changed = BlockNavigation?.AutoUpdate(start + 1, start + count) ?? false;
+                if (changed)
+                    TextArea?.TextView?.Redraw();
+            }
         }
 
         protected void TrySetChunk(ViewModels.TextDiffSelectedChunk chunk)