feature: supports branch compare (#174)

src/Commands/QuerySingleCommit.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Text;
 
 namespace SourceGit.Commands
 {

src/Resources/Locales/en_US.axaml

@@ -33,6 +33,7 @@
   <x:String x:Key="Text.Blame" xml:space="preserve">Blame</x:String>
   <x:String x:Key="Text.BlameTypeNotSupported" xml:space="preserve">BLAME ON THIS FILE IS NOT SUPPORTED!!!</x:String>
   <x:String x:Key="Text.BranchCM.Checkout" xml:space="preserve">Checkout${0}$</x:String>
+  <x:String x:Key="Text.BranchCM.CompareWithBranch" xml:space="preserve">Compare with Branch</x:String>
   <x:String x:Key="Text.BranchCM.CompareWithHead" xml:space="preserve">Compare with HEAD</x:String>
   <x:String x:Key="Text.BranchCM.CompareWithWorktree" xml:space="preserve">Compare with Worktree</x:String>
   <x:String x:Key="Text.BranchCM.CopyName" xml:space="preserve">Copy Branch Name</x:String>
@@ -49,6 +50,7 @@
   <x:String x:Key="Text.BranchCM.Rename" xml:space="preserve">Rename${0}$</x:String>
   <x:String x:Key="Text.BranchCM.Tracking" xml:space="preserve">Tracking ...</x:String>
   <x:String x:Key="Text.BranchCM.UnsetUpstream" xml:space="preserve">Unset Upstream</x:String>
+  <x:String x:Key="Text.BranchCompare" xml:space="preserve">Branch Compare</x:String>
   <x:String x:Key="Text.Bytes" xml:space="preserve">Bytes</x:String>
   <x:String x:Key="Text.Cancel" xml:space="preserve">CANCEL</x:String>
   <x:String x:Key="Text.ChangeDisplayMode" xml:space="preserve">CHANGE DISPLAY MODE</x:String>

src/Resources/Locales/zh_CN.axaml

@@ -36,6 +36,7 @@
   <x:String x:Key="Text.Blame" xml:space="preserve">逐行追溯(blame)</x:String>
   <x:String x:Key="Text.BlameTypeNotSupported" xml:space="preserve">选中文件不支持该操作!!!</x:String>
   <x:String x:Key="Text.BranchCM.Checkout" xml:space="preserve">检出(checkout)${0}$</x:String>
+  <x:String x:Key="Text.BranchCM.CompareWithBranch" xml:space="preserve">与其他分支对比</x:String>
   <x:String x:Key="Text.BranchCM.CompareWithHead" xml:space="preserve">与当前HEAD比较</x:String>
   <x:String x:Key="Text.BranchCM.CompareWithWorktree" xml:space="preserve">与本地工作树比较</x:String>
   <x:String x:Key="Text.BranchCM.CopyName" xml:space="preserve">复制分支名</x:String>
@@ -52,6 +53,7 @@
   <x:String x:Key="Text.BranchCM.Rename" xml:space="preserve">重命名${0}$</x:String>
   <x:String x:Key="Text.BranchCM.Tracking" xml:space="preserve">切换上游分支...</x:String>
   <x:String x:Key="Text.BranchCM.UnsetUpstream" xml:space="preserve">取消追踪</x:String>
+  <x:String x:Key="Text.BranchCompare" xml:space="preserve">分支比较</x:String>
   <x:String x:Key="Text.Bytes" xml:space="preserve">字节</x:String>
   <x:String x:Key="Text.Cancel" xml:space="preserve">取    消</x:String>
   <x:String x:Key="Text.ChangeDisplayMode" xml:space="preserve">切换变更显示模式</x:String>

src/Resources/Locales/zh_TW.axaml

@@ -36,6 +36,7 @@
   <x:String x:Key="Text.Blame" xml:space="preserve">逐行追溯(blame)</x:String>
   <x:String x:Key="Text.BlameTypeNotSupported" xml:space="preserve">選中檔案不支援該操作!!!</x:String>
   <x:String x:Key="Text.BranchCM.Checkout" xml:space="preserve">檢出(checkout)${0}$</x:String>
+  <x:String x:Key="Text.BranchCM.CompareWithBranch" xml:space="preserve">與其他分支比較</x:String>
   <x:String x:Key="Text.BranchCM.CompareWithHead" xml:space="preserve">與當前HEAD比較</x:String>
   <x:String x:Key="Text.BranchCM.CompareWithWorktree" xml:space="preserve">與本地工作樹比較</x:String>
   <x:String x:Key="Text.BranchCM.CopyName" xml:space="preserve">複製分支名</x:String>
@@ -52,6 +53,7 @@
   <x:String x:Key="Text.BranchCM.Rename" xml:space="preserve">重新命名${0}$</x:String>
   <x:String x:Key="Text.BranchCM.Tracking" xml:space="preserve">切換上游分支...</x:String>
   <x:String x:Key="Text.BranchCM.UnsetUpstream" xml:space="preserve">取消追蹤</x:String>
+  <x:String x:Key="Text.BranchCompare" xml:space="preserve">分支比較</x:String>
   <x:String x:Key="Text.Bytes" xml:space="preserve">位元組</x:String>
   <x:String x:Key="Text.Cancel" xml:space="preserve">取    消</x:String>
   <x:String x:Key="Text.ChangeDisplayMode" xml:space="preserve">切換變更顯示模式</x:String>

src/ViewModels/BranchCompare.cs

@@ -0,0 +1,222 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Threading.Tasks;
+
+using Avalonia.Controls;
+using Avalonia.Threading;
+
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace SourceGit.ViewModels
+{
+    public class BranchCompare : ObservableObject
+    {
+        public Models.Branch Base
+        {
+            get;
+            private set;
+        }
+
+        public Models.Branch To
+        {
+            get;
+            private set;
+        }
+
+        public Models.Commit BaseHead
+        {
+            get => _baseHead;
+            private set => SetProperty(ref _baseHead, value);
+        }
+
+        public Models.Commit ToHead
+        {
+            get => _toHead;
+            private set => SetProperty(ref _toHead, value);
+        }
+
+        public List<Models.Change> VisibleChanges
+        {
+            get => _visibleChanges;
+            private set => SetProperty(ref _visibleChanges, value);
+        }
+
+        public List<Models.Change> SelectedChanges
+        {
+            get => _selectedChanges;
+            set
+            {
+                if (SetProperty(ref _selectedChanges, value))
+                {
+                    if (value != null && value.Count == 1)
+                        DiffContext = new DiffContext(_repo, new Models.DiffOption(Base.Head, To.Head, value[0]), _diffContext);
+                    else
+                        DiffContext = null;
+                }
+            }
+        }
+
+        public string SearchFilter
+        {
+            get => _searchFilter;
+            set
+            {
+                if (SetProperty(ref _searchFilter, value))
+                {
+                    RefreshVisible();
+                }
+            }
+        }
+
+        public DiffContext DiffContext
+        {
+            get => _diffContext;
+            private set => SetProperty(ref _diffContext, value);
+        }
+
+        public BranchCompare(string repo, Models.Branch baseBranch, Models.Branch toBranch)
+        {
+            _repo = repo;
+
+            Base = baseBranch;
+            To = toBranch;
+
+            Task.Run(() =>
+            {
+                var baseHead = new Commands.QuerySingleCommit(_repo, Base.Head).Result();
+                var toHead = new Commands.QuerySingleCommit(_repo, To.Head).Result();
+                _changes = new Commands.CompareRevisions(_repo, Base.Head, To.Head).Result();
+
+                var visible = _changes;
+                if (!string.IsNullOrWhiteSpace(_searchFilter))
+                {
+                    visible = new List<Models.Change>();
+                    foreach (var c in _changes)
+                    {
+                        if (c.Path.Contains(_searchFilter, StringComparison.OrdinalIgnoreCase))
+                            visible.Add(c);
+                    }
+                }
+
+                Dispatcher.UIThread.Invoke(() =>
+                {
+                    BaseHead = baseHead;
+                    ToHead = toHead;
+                    VisibleChanges = visible;
+                });
+            });
+        }
+
+        public void NavigateTo(string commitSHA)
+        {
+            var repo = Preference.FindRepository(_repo);
+            if (repo != null)
+                repo.NavigateToCommit(commitSHA);
+        }
+
+        public void ClearSearchFilter()
+        {
+            SearchFilter = string.Empty;
+        }
+
+        public ContextMenu CreateChangeContextMenu()
+        {
+            if (_selectedChanges == null || _selectedChanges.Count != 1)
+                return null;
+
+            var change = _selectedChanges[0];
+            var menu = new ContextMenu();
+
+            var diffWithMerger = new MenuItem();
+            diffWithMerger.Header = App.Text("DiffWithMerger");
+            diffWithMerger.Icon = App.CreateMenuIcon("Icons.Diff");
+            diffWithMerger.Click += (_, ev) =>
+            {
+                var opt = new Models.DiffOption(Base.Head, To.Head, change);
+                var type = Preference.Instance.ExternalMergeToolType;
+                var exec = Preference.Instance.ExternalMergeToolPath;
+
+                var tool = Models.ExternalMerger.Supported.Find(x => x.Type == type);
+                if (tool == null || !File.Exists(exec))
+                {
+                    App.RaiseException(_repo, "Invalid merge tool in preference setting!");
+                    return;
+                }
+
+                var args = tool.Type != 0 ? tool.DiffCmd : Preference.Instance.ExternalMergeToolDiffCmd;
+                Task.Run(() => Commands.MergeTool.OpenForDiff(_repo, exec, args, opt));
+                ev.Handled = true;
+            };
+            menu.Items.Add(diffWithMerger);
+
+            if (change.Index != Models.ChangeState.Deleted)
+            {
+                var full = Path.GetFullPath(Path.Combine(_repo, change.Path));
+                var explore = new MenuItem();
+                explore.Header = App.Text("RevealFile");
+                explore.Icon = App.CreateMenuIcon("Icons.Folder.Open");
+                explore.IsEnabled = File.Exists(full);
+                explore.Click += (_, ev) =>
+                {
+                    Native.OS.OpenInFileManager(full, true);
+                    ev.Handled = true;
+                };
+                menu.Items.Add(explore);
+            }
+
+            var copyPath = new MenuItem();
+            copyPath.Header = App.Text("CopyPath");
+            copyPath.Icon = App.CreateMenuIcon("Icons.Copy");
+            copyPath.Click += (_, ev) =>
+            {
+                App.CopyText(change.Path);
+                ev.Handled = true;
+            };
+            menu.Items.Add(copyPath);
+
+            var copyFileName = new MenuItem();
+            copyFileName.Header = App.Text("CopyFileName");
+            copyFileName.Icon = App.CreateMenuIcon("Icons.Copy");
+            copyFileName.Click += (_, e) =>
+            {
+                App.CopyText(Path.GetFileName(change.Path));
+                e.Handled = true;
+            };
+            menu.Items.Add(copyFileName);
+
+            return menu;
+        }
+
+        private void RefreshVisible()
+        {
+            if (_changes == null)
+                return;
+
+            if (string.IsNullOrEmpty(_searchFilter))
+            {
+                VisibleChanges = _changes;
+            }
+            else
+            {
+                var visible = new List<Models.Change>();
+                foreach (var c in _changes)
+                {
+                    if (c.Path.Contains(_searchFilter, StringComparison.OrdinalIgnoreCase))
+                        visible.Add(c);
+                }
+
+                VisibleChanges = visible;
+            }
+        }
+
+        private string _repo = string.Empty;
+        private Models.Commit _baseHead = null;
+        private Models.Commit _toHead = null;
+        private List<Models.Change> _changes = null;
+        private List<Models.Change> _visibleChanges = null;
+        private List<Models.Change> _selectedChanges = null;
+        private string _searchFilter = string.Empty;
+        private DiffContext _diffContext = null;
+    }
+}

src/ViewModels/Repository.cs

@@ -909,6 +909,13 @@ namespace SourceGit.ViewModels
                 }
 
                 menu.Items.Add(push);
+
+                var compareWithBranch = CreateMenuItemToCompareBranches(branch);
+                if (compareWithBranch != null)
+                {
+                    menu.Items.Add(new MenuItem() { Header = "-" });
+                    menu.Items.Add(compareWithBranch);
+                }
             }
             else
             {
@@ -968,24 +975,6 @@ namespace SourceGit.ViewModels
                 menu.Items.Add(merge);
                 menu.Items.Add(rebase);
 
-                var compare = new MenuItem();
-                compare.Header = App.Text("BranchCM.CompareWithHead");
-                compare.Icon = App.CreateMenuIcon("Icons.Compare");
-                compare.Click += (o, e) =>
-                {
-                    SearchResultSelectedCommit = null;
-
-                    if (_histories != null)
-                    {
-                        var target = new Commands.QuerySingleCommit(FullPath, branch.Head).Result();
-                        var head = new Commands.QuerySingleCommit(FullPath, current.Head).Result();
-                        _histories.AutoSelectedCommit = null;
-                        _histories.DetailContext = new RevisionCompare(FullPath, target, head);
-                    }
-
-                    e.Handled = true;
-                };
-
                 if (WorkingCopyChangesCount > 0)
                 {
                     var compareWithWorktree = new MenuItem();
@@ -1002,11 +991,18 @@ namespace SourceGit.ViewModels
                             _histories.DetailContext = new RevisionCompare(FullPath, target, null);
                         }
                     };
+                    menu.Items.Add(new MenuItem() { Header = "-" });
                     menu.Items.Add(compareWithWorktree);
                 }
 
+                var compareWithBranch = CreateMenuItemToCompareBranches(branch);
+                if (compareWithBranch != null)
+                {
+                    if (WorkingCopyChangesCount == 0)
                         menu.Items.Add(new MenuItem() { Header = "-" });
-                menu.Items.Add(compare);
+
+                    menu.Items.Add(compareWithBranch);
+                }                    
             }
 
             var type = GitFlow.GetBranchType(branch.Name);
@@ -1263,28 +1259,9 @@ namespace SourceGit.ViewModels
                 menu.Items.Add(merge);
                 menu.Items.Add(rebase);
                 menu.Items.Add(new MenuItem() { Header = "-" });
-
-                if (current.Head != branch.Head)
-                {
-                    var compare = new MenuItem();
-                    compare.Header = App.Text("BranchCM.CompareWithHead");
-                    compare.Icon = App.CreateMenuIcon("Icons.Compare");
-                    compare.Click += (o, e) =>
-                    {
-                        SearchResultSelectedCommit = null;
-
-                        if (_histories != null)
-                        {
-                            var target = new Commands.QuerySingleCommit(FullPath, branch.Head).Result();
-                            var head = new Commands.QuerySingleCommit(FullPath, current.Head).Result();
-                            _histories.AutoSelectedCommit = null;
-                            _histories.DetailContext = new RevisionCompare(FullPath, target, head);
             }
 
-                        e.Handled = true;
+            var hasCompare = false;
-                    };
-                    menu.Items.Add(compare);
-
             if (WorkingCopyChangesCount > 0)
             {
                 var compareWithWorktree = new MenuItem();
@@ -1302,11 +1279,18 @@ namespace SourceGit.ViewModels
                     }
                 };
                 menu.Items.Add(compareWithWorktree);
+                hasCompare = true;
             }
 
+            var compareWithBranch = CreateMenuItemToCompareBranches(branch);
+            if (compareWithBranch != null)
+            {
+                menu.Items.Add(compareWithBranch);
+                hasCompare = true;
+            }
+
+            if (hasCompare)
                 menu.Items.Add(new MenuItem() { Header = "-" });
-                }
-            }
 
             var delete = new MenuItem();
             delete.Header = new Views.NameHighlightedTextBlock("BranchCM.Delete", $"{branch.Remote}/{branch.Name}");
@@ -1485,6 +1469,41 @@ namespace SourceGit.ViewModels
             return menu;
         }
 
+        private MenuItem CreateMenuItemToCompareBranches(Models.Branch branch)
+        {
+            if (Branches.Count == 1)
+                return null;
+
+            var compare = new MenuItem();
+            compare.Header = App.Text("BranchCM.CompareWithBranch");
+            compare.Icon = App.CreateMenuIcon("Icons.Compare");
+
+            foreach (var b in Branches)
+            {
+                if (b.FullName != branch.FullName)
+                {
+                    var dup = b;
+                    var target = new MenuItem();
+                    target.Header = b.IsLocal ? b.Name : $"{b.Remote}/{b.Name}";
+                    target.Icon = App.CreateMenuIcon(b.IsCurrent ? "Icons.Check" : "Icons.Branch");
+                    target.Click += (_, e) =>
+                    {
+                        var wnd = new Views.BranchCompare()
+                        {
+                            DataContext = new BranchCompare(FullPath, branch, dup)
+                        };
+
+                        wnd.Show(App.GetTopLevel() as Window);
+                        e.Handled = true;
+                    };
+
+                    compare.Items.Add(target);
+                }
+            }
+
+            return compare;
+        }
+
         private BranchTreeNode.Builder BuildBranchTree(List<Models.Branch> branches, List<Models.Remote> remotes)
         {
             var builder = new BranchTreeNode.Builder();

src/Views/BranchCompare.axaml

@@ -0,0 +1,240 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:m="using:SourceGit.Models"
+        xmlns:vm="using:SourceGit.ViewModels"
+        xmlns:v="using:SourceGit.Views"
+        xmlns:c="using:SourceGit.Converters"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="SourceGit.Views.BranchCompare"
+        x:DataType="vm:BranchCompare"
+        x:Name="me"
+        Icon="/App.ico"
+        Title="{DynamicResource Text.BranchCompare}"
+        Background="Transparent"
+        WindowStartupLocation="CenterOwner"
+        MinWidth="1280" MinHeight="720"
+        ExtendClientAreaToDecorationsHint="True"
+        ExtendClientAreaChromeHints="NoChrome"
+        SystemDecorations="{OnPlatform Full, Linux=None}">
+  <Grid Margin="{Binding #me.WindowState, Converter={x:Static c:WindowStateConverters.ToContentMargin}}">
+    <Grid.RowDefinitions>
+      <RowDefinition Height="30"/>
+      <RowDefinition Height="64"/>
+      <RowDefinition Height="*"/>
+    </Grid.RowDefinitions>
+
+    <!-- Custom window shadow for Linux -->
+    <Border Grid.Row="0" Grid.RowSpan="3"
+            Background="{DynamicResource Brush.Window}"
+            Effect="drop-shadow(0 0 6 #A0000000)"
+            IsVisible="{OnPlatform False, Linux=True}"/>
+
+    <!-- TitleBar -->
+    <Grid Grid.Row="0" ColumnDefinitions="Auto,Auto,*,Auto">
+      <!-- Bottom border -->
+      <Border Grid.Column="0" Grid.ColumnSpan="4"
+              Background="{DynamicResource Brush.TitleBar}"
+              BorderThickness="0,0,0,1" BorderBrush="{DynamicResource Brush.Border2}"
+              DoubleTapped="MaximizeOrRestoreWindow"
+              PointerPressed="BeginMoveWindow"/>
+
+      <!-- Caption Buttons (macOS) -->
+      <Border Grid.Column="0" IsVisible="{OnPlatform False, macOS=True}">
+        <v:CaptionButtonsMacOS/>
+      </Border>
+
+      <!-- Icon -->
+      <Path Grid.Column="1" Margin="8,0,0,0" Width="12" Height="12" Data="{StaticResource Icons.Compare}"/>
+
+      <!-- Title -->
+      <TextBlock Grid.Column="2" Margin="8,0,0,0" Text="{DynamicResource Text.BranchCompare}" FontWeight="Bold" IsHitTestVisible="False" VerticalAlignment="Center"/>
+
+      <!-- Caption Buttons (Windows/Linux) -->
+      <Border Grid.Column="3" IsVisible="{OnPlatform True, macOS=False}">
+        <v:CaptionButtons/>
+      </Border>
+    </Grid>
+
+    <!-- Compare Targets -->
+    <Border Grid.Row="1" Background="{DynamicResource Brush.Window}">
+      <Grid Margin="48,8,48,8" ColumnDefinitions="*,48,*">
+        <Border Grid.Column="0" BorderBrush="{DynamicResource Brush.Border2}" BorderThickness="1" Background="{DynamicResource Brush.Contents}" CornerRadius="4" Padding="4">
+          <Grid RowDefinitions="Auto,*">
+            <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto,Auto,Auto">
+              <v:Avatar Width="16" Height="16"
+                        VerticalAlignment="Center"
+                        IsHitTestVisible="False"
+                        User="{Binding BaseHead.Author}"/>
+              <TextBlock Grid.Column="1" Classes="monospace" Text="{Binding BaseHead.Author.Name}" Margin="8,0,0,0"/>
+              <Border Grid.Column="2" Background="{DynamicResource Brush.Accent}" CornerRadius="4">
+                <TextBlock Text="{Binding Base, Converter={x:Static c:BranchConverters.ToName}}" Classes="monospace" Margin="4,0" Foreground="#FFDDDDDD"/>
+              </Border>
+              <TextBlock Grid.Column="3" Classes="monospace" Text="{Binding BaseHead.SHA, Converter={x:Static c:StringConverters.ToShortSHA}}" Foreground="DarkOrange" Margin="8,0,0,0" TextDecorations="Underline" PointerPressed="OnPressedSHA"/>
+              <TextBlock Grid.Column="4" Classes="monospace" Text="{Binding BaseHead.CommitterTimeStr}" Foreground="{DynamicResource Brush.FG2}" Margin="8,0,0,0"/>
+            </Grid>
+
+            <TextBlock Grid.Row="1" Classes="monospace" Text="{Binding BaseHead.Subject}" VerticalAlignment="Bottom"/>
+          </Grid>
+        </Border>
+
+        <Path Grid.Column="1" Width="16" Height="16" Fill="{DynamicResource Brush.FG2}" Data="{DynamicResource Icons.Down}" RenderTransformOrigin="50%,50%" RenderTransform="rotate(270deg)"/>
+
+        <Border Grid.Column="2" BorderBrush="{DynamicResource Brush.Border2}" BorderThickness="1" Background="{DynamicResource Brush.Contents}" CornerRadius="4" Padding="4">
+          <Grid RowDefinitions="Auto,*">
+            <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto,Auto,Auto">
+              <v:Avatar Width="16" Height="16"
+                        VerticalAlignment="Center"
+                        IsHitTestVisible="False"
+                        User="{Binding ToHead.Author}"/>
+              <TextBlock Grid.Column="1" Classes="monospace" Text="{Binding ToHead.Author.Name}" Margin="8,0,0,0"/>
+              <Border Grid.Column="2" Background="{DynamicResource Brush.Accent}" CornerRadius="4">
+                <TextBlock Text="{Binding To, Converter={x:Static c:BranchConverters.ToName}}" Classes="monospace" Margin="4,0" Foreground="#FFDDDDDD"/>
+              </Border>
+              <TextBlock Grid.Column="3" Classes="monospace" Text="{Binding ToHead.SHA, Converter={x:Static c:StringConverters.ToShortSHA}}" Foreground="DarkOrange" Margin="8,0,0,0" TextDecorations="Underline" PointerPressed="OnPressedSHA"/>
+              <TextBlock Grid.Column="4" Classes="monospace" Text="{Binding ToHead.CommitterTimeStr}" Foreground="{DynamicResource Brush.FG2}" Margin="8,0,0,0"/>
+            </Grid>
+
+            <TextBlock Grid.Row="1" Classes="monospace" Text="{Binding ToHead.Subject}" VerticalAlignment="Bottom"/>
+          </Grid>
+        </Border>
+      </Grid>
+    </Border>    
+
+    <!-- Changes -->
+    <Border Grid.Row="2" Background="{DynamicResource Brush.Window}">
+      <Grid Margin="8,0,8,8">
+        <Grid.ColumnDefinitions>
+          <ColumnDefinition Width="256" MinWidth="200" MaxWidth="480"/>
+          <ColumnDefinition Width="4"/>
+          <ColumnDefinition Width="*"/>
+        </Grid.ColumnDefinitions>
+
+        <Grid Grid.Column="0" RowDefinitions="26,*">
+          <!-- Search & Display Mode -->
+          <Grid Grid.Row="0" ColumnDefinitions="*,18">
+            <TextBox Grid.Column="0"
+                     Height="26"
+                     BorderThickness="1" BorderBrush="{DynamicResource Brush.Border2}"
+                     Background="Transparent"
+                     CornerRadius="4"
+                     Watermark="{DynamicResource Text.CommitDetail.Changes.Search}"
+                     Text="{Binding SearchFilter, Mode=TwoWay}">
+              <TextBox.InnerLeftContent>
+                <Path Width="14" Height="14" Margin="4,0,0,0" Fill="{DynamicResource Brush.FG2}" Data="{StaticResource Icons.Search}"/>
+              </TextBox.InnerLeftContent>
+
+              <TextBox.InnerRightContent>
+                <Button Classes="icon_button"
+                        IsVisible="{Binding SearchFilter, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"
+                        Command="{Binding ClearSearchFilter}">
+                  <Path Width="14" Height="14" Fill="{DynamicResource Brush.FG2}" Data="{StaticResource Icons.Clear}"/>
+                </Button>
+              </TextBox.InnerRightContent>
+            </TextBox>
+
+            <v:ChangeViewModeSwitcher Grid.Column="1"
+                                      Width="14" Height="14"
+                                      HorizontalAlignment="Right"
+                                      ViewMode="{Binding Source={x:Static vm:Preference.Instance}, Path=CommitChangeViewMode, Mode=TwoWay}"/>
+          </Grid>
+
+          <!-- Changes -->
+          <Border Grid.Row="1" Margin="0,4,0,0" BorderBrush="{DynamicResource Brush.Border2}" BorderThickness="1" Background="{DynamicResource Brush.Contents}">
+            <v:ChangeCollectionView IsWorkingCopyChange="False"
+                                    ViewMode="{Binding Source={x:Static vm:Preference.Instance}, Path=CommitChangeViewMode}"
+                                    Changes="{Binding VisibleChanges}"
+                                    SelectedChanges="{Binding SelectedChanges, Mode=TwoWay}"
+                                    ContextRequested="OnChangeContextRequested"/>
+          </Border>
+        </Grid>
+
+        <GridSplitter Grid.Column="1"
+                      MinWidth="1"
+                      HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
+                      Background="Transparent"/>
+
+        <Grid Grid.Column="2">
+          <Border BorderThickness="1" BorderBrush="{DynamicResource Brush.Border2}">
+            <StackPanel Orientation="Vertical" VerticalAlignment="Center">
+              <Path Width="64" Height="64" Data="{StaticResource Icons.Diff}" Fill="{DynamicResource Brush.FG2}"/>
+              <TextBlock Margin="0,16,0,0"
+                         Text="{DynamicResource Text.Diff.Welcome}"
+                         FontSize="18" FontWeight="Bold"
+                         Foreground="{DynamicResource Brush.FG2}"
+                         HorizontalAlignment="Center"/>
+            </StackPanel>
+          </Border>
+
+          <ContentControl Content="{Binding DiffContext}">
+            <ContentControl.DataTemplates>
+              <DataTemplate DataType="vm:DiffContext">
+                <v:DiffView/>
+              </DataTemplate>
+            </ContentControl.DataTemplates>
+          </ContentControl>
+        </Grid>
+      </Grid>
+    </Border>
+
+    <!-- Custom window sizer for Linux -->
+    <Grid Grid.Row="0" Grid.RowSpan="3" IsVisible="{OnPlatform False, Linux=True}" IsHitTestVisible="{Binding #me.WindowState, Converter={x:Static c:WindowStateConverters.IsNormal}}">
+      <Border Width="4" Height="4"
+              Background="Transparent"
+              HorizontalAlignment="Left" VerticalAlignment="Top"
+              Cursor="TopLeftCorner"
+              Tag="{x:Static WindowEdge.NorthWest}"
+              PointerPressed="CustomResizeWindow"/>
+
+      <Border Height="4" Margin="4,0"
+              Background="Transparent"
+              HorizontalAlignment="Stretch" VerticalAlignment="Top"
+              Cursor="TopSide"
+              Tag="{x:Static WindowEdge.North}"
+              PointerPressed="CustomResizeWindow"/>
+
+      <Border Width="4" Height="4"
+              Background="Transparent"
+              HorizontalAlignment="Right" VerticalAlignment="Top"
+              Cursor="TopRightCorner"
+              Tag="{x:Static WindowEdge.NorthEast}"
+              PointerPressed="CustomResizeWindow"/>
+
+      <Border Width="4" Margin="0,4"
+              Background="Transparent"
+              HorizontalAlignment="Left" VerticalAlignment="Stretch"
+              Cursor="LeftSide"
+              Tag="{x:Static WindowEdge.West}"
+              PointerPressed="CustomResizeWindow"/>
+
+      <Border Width="4" Margin="0,4"
+              Background="Transparent"
+              HorizontalAlignment="Right" VerticalAlignment="Stretch"
+              Cursor="RightSide"
+              Tag="{x:Static WindowEdge.East}"
+              PointerPressed="CustomResizeWindow"/>
+
+      <Border Width="4" Height="4"
+              Background="Transparent"
+              HorizontalAlignment="Left" VerticalAlignment="Bottom"
+              Cursor="BottomLeftCorner"
+              Tag="{x:Static WindowEdge.SouthWest}"
+              PointerPressed="CustomResizeWindow"/>
+
+      <Border Height="4" Margin="4,0"
+              Background="Transparent"
+              HorizontalAlignment="Stretch" VerticalAlignment="Bottom"
+              Cursor="BottomSide"
+              Tag="{x:Static WindowEdge.South}"
+              PointerPressed="CustomResizeWindow"/>
+
+      <Border Width="4" Height="4"
+              Background="Transparent"
+              HorizontalAlignment="Right" VerticalAlignment="Bottom"
+              Cursor="BottomRightCorner"
+              Tag="{x:Static WindowEdge.SouthEast}"
+              PointerPressed="CustomResizeWindow"/>
+    </Grid>
+  </Grid>
+</Window>

src/Views/BranchCompare.axaml.cs

@@ -0,0 +1,58 @@
+using Avalonia.Controls;
+using Avalonia.Input;
+
+namespace SourceGit.Views
+{
+    public partial class BranchCompare : Window
+    {
+        public BranchCompare()
+        {
+            InitializeComponent();
+        }
+
+        private void MaximizeOrRestoreWindow(object sender, TappedEventArgs e)
+        {
+            if (WindowState == WindowState.Maximized)
+                WindowState = WindowState.Normal;
+            else
+                WindowState = WindowState.Maximized;
+
+            e.Handled = true;
+        }
+
+        private void CustomResizeWindow(object sender, PointerPressedEventArgs e)
+        {
+            if (sender is Border border)
+            {
+                if (border.Tag is WindowEdge edge)
+                {
+                    BeginResizeDrag(edge, e);
+                }
+            }
+        }
+
+        private void BeginMoveWindow(object sender, PointerPressedEventArgs e)
+        {
+            BeginMoveDrag(e);
+        }
+
+        private void OnChangeContextRequested(object sender, ContextRequestedEventArgs e)
+        {
+            if (DataContext is ViewModels.BranchCompare vm && sender is ChangeCollectionView view)
+            {
+                var menu = vm.CreateChangeContextMenu();
+                view.OpenContextMenu(menu);
+            }
+
+            e.Handled = true;
+        }
+
+        private void OnPressedSHA(object sender, PointerPressedEventArgs e)
+        {
+            if (DataContext is ViewModels.BranchCompare vm && sender is TextBlock block)
+                vm.NavigateTo(block.Text);
+
+            e.Handled = true;
+        }
+    }
+}