Merge cd946d2ba5 into 4b6bb70f20

I.e when unset or already at first/last change-block (or the only one).

src/Commands/Diff.cs

@@ -51,6 +51,9 @@ namespace SourceGit.Commands
                     _result.TextDiff.MaxLineNumber = Math.Max(_newLine, _oldLine);
             }
 
+            if (_result.TextDiff != null)
+                _result.TextDiff.ProcessChangeBlocks();
+
             return _result;
         }
 

src/Models/DiffResult.cs

@@ -2,6 +2,8 @@
 using System.Text;
 using System.Text.RegularExpressions;
 
+using CommunityToolkit.Mvvm.ComponentModel;
+
 using Avalonia;
 using Avalonia.Media.Imaging;
 
@@ -59,16 +61,70 @@ namespace SourceGit.Models
         }
     }
 
-    public partial class TextDiff
+    public class TextDiffChangeBlock
+    {
+        public TextDiffChangeBlock(int startLine, int endLine)
+        {
+            StartLine = startLine;
+            EndLine = endLine;
+        }
+
+        public int StartLine { get; set; } = 0;
+        public int EndLine { get; set; } = 0;
+
+        public bool IsInRange(int line)
+        {
+            return line >= StartLine && line <= EndLine;
+        }
+    }
+
+    public partial class TextDiff : ObservableObject
     {
         public string File { get; set; } = string.Empty;
         public List<TextDiffLine> Lines { get; set; } = new List<TextDiffLine>();
         public Vector ScrollOffset { get; set; } = Vector.Zero;
         public int MaxLineNumber = 0;
 
+        public int CurrentChangeBlockIdx
+        {
+            get => _currentChangeBlockIdx;
+            set => SetProperty(ref _currentChangeBlockIdx, value);
+        }
+
         public string Repo { get; set; } = null;
         public DiffOption Option { get; set; } = null;
 
+        public List<TextDiffChangeBlock> ChangeBlocks { get; set; } = [];
+
+        public void ProcessChangeBlocks()
+        {
+            ChangeBlocks.Clear();
+            int lineIdx = 0, blockStartIdx = 0;
+            bool isNewBlock = true;
+            foreach (var line in Lines)
+            {
+                lineIdx++;
+                if (line.Type == Models.TextDiffLineType.Added ||
+                    line.Type == Models.TextDiffLineType.Deleted ||
+                    line.Type == Models.TextDiffLineType.None) // Empty
+                {
+                    if (isNewBlock)
+                    {
+                        isNewBlock = false;
+                        blockStartIdx = lineIdx;
+                    }
+                }
+                else
+                {
+                    if (!isNewBlock)
+                    {
+                        ChangeBlocks.Add(new TextDiffChangeBlock(blockStartIdx, lineIdx - 1));
+                        isNewBlock = true;
+                    }
+                }
+            }
+        }
+
         public TextDiffSelection MakeSelection(int startLine, int endLine, bool isCombined, bool isOldSide)
         {
             var rs = new TextDiffSelection();
@@ -626,6 +682,8 @@ namespace SourceGit.Models
             return true;
         }
 
+        private int _currentChangeBlockIdx = -1; // NOTE: Use -1 as "not set".
+
         [GeneratedRegex(@"^@@ \-(\d+),?\d* \+(\d+),?\d* @@")]
         private static partial Regex REG_INDICATOR();
     }

src/Resources/Icons.axaml

@@ -25,6 +25,8 @@
   <StreamGeometry x:Key="Icons.Detached">M128 183C128 154 154 128 183 128h521c30 0 55 26 55 55v38c0 17-17 34-34 34s-34-17-34-34v-26H196v495h26c17 0 34 17 34 34s-17 34-34 34h-38c-30 0-55-26-55-55V183zM380 896h-34c-26 0-47-21-47-47v-90h68V828h64V896H380c4 0 0 0 0 0zM759 828V896h90c26 0 47-21 47-47v-90h-68V828h-68zM828 435H896V346c0-26-21-47-47-47h-90v68H828v68zM435 299v68H367V439H299V346C299 320 320 299 346 299h90zM367 649H299v-107h68v107zM546 367V299h107v68h-107zM828 546H896v107h-68v-107zM649 828V896h-107v-68h107zM730 508v188c0 17-17 34-34 34h-188c-17 0-34-17-34-34s17-34 34-34h102l-124-124c-13-13-13-34 0-47 13-13 34-13 47 0l124 124V512c0-17 17-34 34-34 21-4 38 9 38 30z</StreamGeometry>
   <StreamGeometry x:Key="Icons.Detail">M889 0H135c-32 0-59 26-59 59v906c0 32 26 59 59 59h753c32 0 59-26 59-59v-906c1-33-26-59-58-59zm-165 177c31 0 56 25 56 56s-25 56-56 56-56-25-56-56 25-56 56-56zm-212 0c31 0 56 25 56 56S543 288 512 288s-56-25-56-56S481 177 512 177zm-212 0c31 0 56 25 56 56s-25 56-56 56-56-25-56-56 25-56 56-56zm209 606H285c-25 0-44-20-44-44 0-25 20-44 44-44h224c25 0 44 20 44 44 0 24-20 44-44 44zm230-212H285c-25 0-44-20-44-44 0-25 20-44 44-44h453c25 0 44 20 44 44 1 24-20 44-44 44z</StreamGeometry>
   <StreamGeometry x:Key="Icons.Diff">M854 307 611 73c-6-6-14-9-22-9H296c-4 0-8 4-8 8v56c0 4 4 8 8 8h277l219 211V824c0 4 4 8 8 8h56c4 0 8-4 8-8V330c0-9-4-17-10-23zM553 201c-6-6-14-9-23-9H192c-18 0-32 14-32 32v704c0 18 14 32 32 32h512c18 0 32-14 32-32V397c0-9-3-17-9-23L553 201zM568 753c0 4-3 7-8 7h-225c-4 0-8-3-8-7v-42c0-4 3-7 8-7h225c4 0 8 3 8 7v42zm0-220c0 4-3 7-8 7H476v85c0 4-3 7-7 7h-42c-4 0-7-3-7-7V540h-85c-4 0-8-3-8-7v-42c0-4 3-7 8-7H420v-85c0-4 3-7 7-7h42c4 0 7 3 7 7V484h85c4 0 8 3 8 7v42z</StreamGeometry>
+  <StreamGeometry x:Key="Icons.Diff.Prev">M4.21157,12.7326 C3.9244,13.0312 3.93361,13.5059 4.23213,13.7931 C4.53064,14.0803 5.00543,14.0711 5.29259,13.7725 L13.2521,5.49831 L13.2521,24.2511 C13.2521,24.6653 13.5879,25.0011 14.0021,25.0011 C14.4163,25.0011 14.7521,24.6653 14.7521,24.2511 L14.7521,5.4993 L22.7106,13.7725 C22.9978,14.0711 23.4726,14.0803 23.7711,13.7931 C24.0696,13.5059 24.0788,13.0312 23.7916,12.7326 L14.7223,3.30466 C14.3289,2.89568 13.6743,2.89568 13.2809,3.30466 L4.21157,12.7326 Z</StreamGeometry>
+  <StreamGeometry x:Key="Icons.Diff.Next">M23.7916,15.2664 C24.0788,14.9679 24.0696,14.4931 23.7711,14.206 C23.4726,13.9188 22.9978,13.928 22.7106,14.2265 L14.7511,22.5007 L14.7511,3.74792 C14.7511,3.33371 14.4153,2.99792 14.0011,2.99792 C13.5869,2.99792 13.2511,3.33371 13.2511,3.74793 L13.2511,22.4998 L5.29259,14.2265 C5.00543,13.928 4.53064,13.9188 4.23213,14.206 C3.93361,14.4931 3.9244,14.9679 4.21157,15.2664 L13.2809,24.6944 C13.6743,25.1034 14.3289,25.1034 14.7223,24.6944 L23.7916,15.2664 Z</StreamGeometry>
   <StreamGeometry x:Key="Icons.DoubleDown">M256 224l0 115L512 544l256-205 0-115-256 205L256 224zM512 685l-256-205L256 595 512 800 768 595l0-115L512 685z</StreamGeometry>
   <StreamGeometry x:Key="Icons.DoubleUp">M768 800V685L512 480 256 685V800l256-205L768 800zM512 339 768 544V429L512 224 256 429V544l256-205z</StreamGeometry>
   <StreamGeometry x:Key="Icons.Down">M509 546l271-271 91 91-348 349-1-1-13 13-363-361 91-91z</StreamGeometry>

src/ViewModels/DiffContext.cs

@@ -73,6 +73,40 @@ namespace SourceGit.ViewModels
             LoadDiffContent();
         }
 
+        public void PrevChange()
+        {
+            if (_content is Models.TextDiff textDiff)
+            {
+                if (textDiff.CurrentChangeBlockIdx > 0)
+                {
+                    textDiff.CurrentChangeBlockIdx--;
+                }
+                else if (textDiff.ChangeBlocks.Count > 0)
+                {
+                    // Force property value change and (re-)jump to first change block
+                    textDiff.CurrentChangeBlockIdx = -1;
+                    textDiff.CurrentChangeBlockIdx = 0;
+                }
+            }
+        }
+
+        public void NextChange()
+        {
+            if (_content is Models.TextDiff textDiff)
+            {
+                if (textDiff.CurrentChangeBlockIdx < textDiff.ChangeBlocks.Count - 1)
+                {
+                    textDiff.CurrentChangeBlockIdx++;
+                }
+                else if (textDiff.ChangeBlocks.Count > 0)
+                {
+                    // Force property value change and (re-)jump to last change block
+                    textDiff.CurrentChangeBlockIdx = -1;
+                    textDiff.CurrentChangeBlockIdx = textDiff.ChangeBlocks.Count - 1;
+                }
+            }
+        }
+
         public void ToggleFullTextDiff()
         {
             Preference.Instance.UseFullTextDiff = !Preference.Instance.UseFullTextDiff;

src/ViewModels/TwoSideTextDiff.cs

@@ -45,10 +45,43 @@ namespace SourceGit.ViewModels
 
             FillEmptyLines();
 
+            ProcessChangeBlocks();
+
             if (previous != null && previous.File == File)
                 _syncScrollOffset = previous._syncScrollOffset;
         }
 
+        public List<Models.TextDiffChangeBlock> ChangeBlocks { get; set; } = [];
+
+        public void ProcessChangeBlocks()
+        {
+            ChangeBlocks.Clear();
+            int lineIdx = 0, blockStartIdx = 0;
+            bool isNewBlock = true;
+            foreach (var line in Old) // NOTE: Same block size in both Old and New lines.
+            {
+                lineIdx++;
+                if (line.Type == Models.TextDiffLineType.Added ||
+                    line.Type == Models.TextDiffLineType.Deleted ||
+                    line.Type == Models.TextDiffLineType.None) // Empty
+                {
+                    if (isNewBlock)
+                    {
+                        isNewBlock = false;
+                        blockStartIdx = lineIdx;
+                    }
+                }
+                else
+                {
+                    if (!isNewBlock)
+                    {
+                        ChangeBlocks.Add(new Models.TextDiffChangeBlock(blockStartIdx, lineIdx - 1));
+                        isNewBlock = true;
+                    }
+                }
+            }
+        }
+
         public void ConvertsToCombinedRange(Models.TextDiff combined, ref int startLine, ref int endLine, bool isOldSide)
         {
             endLine = Math.Min(endLine, combined.Lines.Count - 1);

src/Views/DiffView.axaml

@@ -34,6 +34,20 @@
 
           <!-- Toolbar Buttons -->
           <StackPanel Grid.Column="3" Margin="8,0,0,0" Orientation="Horizontal" VerticalAlignment="Center">
+            <Button Classes="icon_button"
+                    Width="32"
+                    Command="{Binding PrevChange}"
+                    IsVisible="{Binding IsTextDiff}"
+                    ToolTip.Tip="{DynamicResource Text.Diff.Prev}">
+              <Path Width="12" Height="12" Stretch="Uniform" Margin="0,6,0,0" Data="{StaticResource Icons.Diff.Prev}"/>
+            </Button>
+            <Button Classes="icon_button"
+                    Width="32"
+                    Command="{Binding NextChange}"
+                    IsVisible="{Binding IsTextDiff}"
+                    ToolTip.Tip="{DynamicResource Text.Diff.Next}">
+              <Path Width="12" Height="12" Stretch="Uniform" Margin="0,6,0,0" Data="{StaticResource Icons.Diff.Next}"/>
+            </Button>
             <Button Classes="icon_button" 
                     Width="32" 
                     Command="{Binding IncrUnified}" 
@@ -232,7 +246,8 @@
           <DataTemplate DataType="m:TextDiff">
             <v:TextDiffView 
               UseSideBySideDiff="{Binding Source={x:Static vm:Preference.Instance}, Path=UseSideBySideDiff, Mode=OneWay}"
-              UseFullTextDiff="{Binding Source={x:Static vm:Preference.Instance}, Path=UseFullTextDiff, Mode=OneWay}"/>
+              UseFullTextDiff="{Binding Source={x:Static vm:Preference.Instance}, Path=UseFullTextDiff, Mode=OneWay}"
+              CurrentChangeBlockIdx="{Binding CurrentChangeBlockIdx, Mode=OneWay}"/>
           </DataTemplate>
 
           <!-- Empty or only EOL changes -->

src/Views/TextDiffView.axaml

@@ -27,6 +27,7 @@
                                        UseSyntaxHighlighting="{Binding Source={x:Static vm:Preference.Instance}, Path=UseSyntaxHighlighting}"
                                        WordWrap="{Binding Source={x:Static vm:Preference.Instance}, Path=EnableDiffViewWordWrap}"
                                        ShowHiddenSymbols="{Binding Source={x:Static vm:Preference.Instance}, Path=ShowHiddenSymbolsInDiffView}"
+                                       CurrentChangeBlockIdx="{Binding #ThisControl.CurrentChangeBlockIdx}"
                                        EnableChunkSelection="{Binding #ThisControl.EnableChunkSelection}"
                                        SelectedChunk="{Binding #ThisControl.SelectedChunk, Mode=TwoWay}"/>
         </DataTemplate>
@@ -49,6 +50,7 @@
                                            UseSyntaxHighlighting="{Binding Source={x:Static vm:Preference.Instance}, Path=UseSyntaxHighlighting}"
                                            WordWrap="False"
                                            ShowHiddenSymbols="{Binding Source={x:Static vm:Preference.Instance}, Path=ShowHiddenSymbolsInDiffView}"
+                                           CurrentChangeBlockIdx="{Binding #ThisControl.CurrentChangeBlockIdx}"
                                            EnableChunkSelection="{Binding #ThisControl.EnableChunkSelection}"
                                            SelectedChunk="{Binding #ThisControl.SelectedChunk, Mode=TwoWay}"/>
 
@@ -70,6 +72,7 @@
                                            UseSyntaxHighlighting="{Binding Source={x:Static vm:Preference.Instance}, Path=UseSyntaxHighlighting}"
                                            WordWrap="False"
                                            ShowHiddenSymbols="{Binding Source={x:Static vm:Preference.Instance}, Path=ShowHiddenSymbolsInDiffView}"
+                                           CurrentChangeBlockIdx="{Binding #ThisControl.CurrentChangeBlockIdx}"
                                            EnableChunkSelection="{Binding #ThisControl.EnableChunkSelection}"
                                            SelectedChunk="{Binding #ThisControl.SelectedChunk, Mode=TwoWay}"/>
           </Grid>

src/Views/TextDiffView.axaml.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.Globalization;
 using System.IO;
+using System.Linq;
 using System.Text;
 
 using Avalonia;
@@ -243,6 +244,10 @@ namespace SourceGit.Views
                 if (_presenter.Document == null || !textView.VisualLinesValid)
                     return;
 
+                var changeBlock = _presenter.GetCurrentChangeBlock();
+                Brush changeBlockBG = new SolidColorBrush(Colors.Gray, 0.25);
+                Pen changeBlockFG = new Pen(Brushes.Gray, 1);
+
                 var lines = _presenter.GetLines();
                 var width = textView.Bounds.Width;
                 foreach (var line in textView.VisualLines)
@@ -255,51 +260,63 @@ namespace SourceGit.Views
                         break;
 
                     var info = lines[index - 1];
-                    var bg = GetBrushByLineType(info.Type);
-                    if (bg == null)
-                        continue;
 
                     var startY = line.GetTextLineVisualYPosition(line.TextLines[0], VisualYPosition.LineTop) - textView.VerticalOffset;
                     var endY = line.GetTextLineVisualYPosition(line.TextLines[^1], VisualYPosition.LineBottom) - textView.VerticalOffset;
-                    drawingContext.DrawRectangle(bg, null, new Rect(0, startY, width, endY - startY));
 
-                    if (info.Highlights.Count > 0)
+                    var bg = GetBrushByLineType(info.Type);
+                    if (bg != null)
                     {
-                        var highlightBG = info.Type == Models.TextDiffLineType.Added ? _presenter.AddedHighlightBrush : _presenter.DeletedHighlightBrush;
-                        var processingIdxStart = 0;
-                        var processingIdxEnd = 0;
-                        var nextHightlight = 0;
+                        if (bg != null)
+                            drawingContext.DrawRectangle(bg, null, new Rect(0, startY, width, endY - startY));
 
-                        foreach (var tl in line.TextLines)
+                        if (info.Highlights.Count > 0)
                         {
-                            processingIdxEnd += tl.Length;
+                            var highlightBG = info.Type == Models.TextDiffLineType.Added ? _presenter.AddedHighlightBrush : _presenter.DeletedHighlightBrush;
+                            var processingIdxStart = 0;
+                            var processingIdxEnd = 0;
+                            var nextHighlight = 0;
 
-                            var y = line.GetTextLineVisualYPosition(tl, VisualYPosition.LineTop) - textView.VerticalOffset;
-                            var h = line.GetTextLineVisualYPosition(tl, VisualYPosition.LineBottom) - textView.VerticalOffset - y;
-
-                            while (nextHightlight < info.Highlights.Count)
+                            foreach (var tl in line.TextLines)
                             {
-                                var highlight = info.Highlights[nextHightlight];
-                                if (highlight.Start >= processingIdxEnd)
-                                    break;
+                                processingIdxEnd += tl.Length;
 
-                                var start = line.GetVisualColumn(highlight.Start < processingIdxStart ? processingIdxStart : highlight.Start);
-                                var end = line.GetVisualColumn(highlight.End >= processingIdxEnd ? processingIdxEnd : highlight.End + 1);
+                                var y = line.GetTextLineVisualYPosition(tl, VisualYPosition.LineTop) - textView.VerticalOffset;
+                                var h = line.GetTextLineVisualYPosition(tl, VisualYPosition.LineBottom) - textView.VerticalOffset - y;
 
-                                var x = line.GetTextLineVisualXPosition(tl, start) - textView.HorizontalOffset;
-                                var w = line.GetTextLineVisualXPosition(tl, end) - textView.HorizontalOffset - x;
-                                var rect = new Rect(x, y, w, h);
-                                drawingContext.DrawRectangle(highlightBG, null, rect);
+                                while (nextHighlight < info.Highlights.Count)
+                                {
+                                    var highlight = info.Highlights[nextHighlight];
+                                    if (highlight.Start >= processingIdxEnd)
+                                        break;
 
-                                if (highlight.End >= processingIdxEnd)
-                                    break;
+                                    var start = line.GetVisualColumn(highlight.Start < processingIdxStart ? processingIdxStart : highlight.Start);
+                                    var end = line.GetVisualColumn(highlight.End >= processingIdxEnd ? processingIdxEnd : highlight.End + 1);
 
-                                nextHightlight++;
+                                    var x = line.GetTextLineVisualXPosition(tl, start) - textView.HorizontalOffset;
+                                    var w = line.GetTextLineVisualXPosition(tl, end) - textView.HorizontalOffset - x;
+                                    var rect = new Rect(x, y, w, h);
+                                    drawingContext.DrawRectangle(highlightBG, null, rect);
+
+                                    if (highlight.End >= processingIdxEnd)
+                                        break;
+
+                                    nextHighlight++;
+                                }
+
+                                processingIdxStart = processingIdxEnd;
                             }
-
-                            processingIdxStart = processingIdxEnd;
                         }
                     }
+
+                    if (changeBlock != null && changeBlock.IsInRange(index))
+                    {
+                        drawingContext.DrawRectangle(changeBlockBG, null, new Rect(0, startY, width, endY - startY));
+                        if (index == changeBlock.StartLine)
+                            drawingContext.DrawLine(changeBlockFG, new Point(0, startY), new Point(width, startY));
+                        if (index == changeBlock.EndLine)
+                            drawingContext.DrawLine(changeBlockFG, new Point(0, endY), new Point(width, endY));
+                    }
                 }
             }
 
@@ -466,6 +483,15 @@ namespace SourceGit.Views
             set => SetValue(SelectedChunkProperty, value);
         }
 
+        public static readonly StyledProperty<int> CurrentChangeBlockIdxProperty =
+            AvaloniaProperty.Register<ThemedTextDiffPresenter, int>(nameof(CurrentChangeBlockIdx));
+
+        public int CurrentChangeBlockIdx
+        {
+            get => GetValue(CurrentChangeBlockIdxProperty);
+            set => SetValue(CurrentChangeBlockIdxProperty, value);
+        }
+
         protected override Type StyleKeyOverride => typeof(TextEditor);
 
         public ThemedTextDiffPresenter(TextArea area, TextDocument doc) : base(area, doc)
@@ -498,6 +524,27 @@ namespace SourceGit.Views
         {
         }
 
+        public Models.TextDiffChangeBlock GetCurrentChangeBlock()
+        {
+            return GetChangeBlock(CurrentChangeBlockIdx);
+        }
+
+        public virtual Models.TextDiffChangeBlock GetChangeBlock(int changeBlockIdx)
+        {
+            return null;
+        }
+
+        public void JumpToChangeBlock(int changeBlockIdx)
+        {
+            var changeBlock = GetChangeBlock(changeBlockIdx);
+            if (changeBlock != null)
+            {
+                TextArea.Caret.Line = changeBlock.StartLine;
+                //TextArea.Caret.BringCaretToView(); // NOTE: Brings caret line (barely) into view.
+                ScrollToLine(changeBlock.StartLine); // NOTE: Brings specified line into center of view.
+            }
+        }
+
         public override void Render(DrawingContext context)
         {
             base.Render(context);
@@ -895,6 +942,16 @@ namespace SourceGit.Views
             }
         }
 
+        public override Models.TextDiffChangeBlock GetChangeBlock(int changeBlockIdx)
+        {
+            if (DataContext is Models.TextDiff diff)
+            {
+                if (changeBlockIdx >= 0 && changeBlockIdx < diff.ChangeBlocks.Count)
+                    return diff.ChangeBlocks[changeBlockIdx];
+            }
+            return null;
+        }
+
         protected override void OnLoaded(RoutedEventArgs e)
         {
             base.OnLoaded(e);
@@ -1109,6 +1166,16 @@ namespace SourceGit.Views
             }
         }
 
+        public override Models.TextDiffChangeBlock GetChangeBlock(int changeBlockIdx)
+        {
+            if (DataContext is ViewModels.TwoSideTextDiff diff)
+            {
+                if (changeBlockIdx >= 0 && changeBlockIdx < diff.ChangeBlocks.Count)
+                    return diff.ChangeBlocks[changeBlockIdx];
+            }
+            return null;
+        }
+
         protected override void OnLoaded(RoutedEventArgs e)
         {
             base.OnLoaded(e);
@@ -1241,6 +1308,15 @@ namespace SourceGit.Views
             set => SetValue(EnableChunkSelectionProperty, value);
         }
 
+        public static readonly StyledProperty<int> CurrentChangeBlockIdxProperty =
+            AvaloniaProperty.Register<TextDiffView, int>(nameof(CurrentChangeBlockIdx));
+
+        public int CurrentChangeBlockIdx
+        {
+            get => GetValue(CurrentChangeBlockIdxProperty);
+            set => SetValue(CurrentChangeBlockIdxProperty, value);
+        }
+
         static TextDiffView()
         {
             UseSideBySideDiffProperty.Changed.AddClassHandler<TextDiffView>((v, _) =>
@@ -1267,6 +1343,17 @@ namespace SourceGit.Views
                 v.Popup.Margin = new Thickness(0, top, right, 0);
                 v.Popup.IsVisible = true;
             });
+
+            CurrentChangeBlockIdxProperty.Changed.AddClassHandler<TextDiffView>((v, e) =>
+            {
+                if (v.Editor.Presenter != null)
+                {
+                    foreach (var p in v.Editor.Presenter.GetVisualDescendants().OfType<ThemedTextDiffPresenter>())
+                    {
+                        p.JumpToChangeBlock((int)e.NewValue);
+                    }
+                }
+            });
         }
 
         public TextDiffView()
@@ -1314,6 +1401,8 @@ namespace SourceGit.Views
 
             IsUnstagedChange = diff.Option.IsUnstaged;
             EnableChunkSelection = diff.Option.WorkingCopyChange != null;
+
+            diff.CurrentChangeBlockIdx = -1; // Unset current change block.
         }
 
         private void OnStageChunk(object _1, RoutedEventArgs _2)