refactor<*>: rewrite all codes...

src/Views/Widgets/DiffViewer.xaml

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+<UserControl x:Class="SourceGit.Views.Widgets.DiffViewer"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
+             xmlns:controls="clr-namespace:SourceGit.Views.Controls"
+             xmlns:models="clr-namespace:SourceGit.Models"
+             mc:Ignorable="d" 
+             d:DesignHeight="450" d:DesignWidth="800">
+    <UserControl.Resources>
+        <Style x:Key="Style.DataGridRow.DiffViewer" TargetType="{x:Type DataGridRow}" BasedOn="{StaticResource Style.DataGridRow}">
+            <EventSetter Event="RequestBringIntoView" Handler="OnTextDiffBringIntoView"/>
+        </Style>
+    </UserControl.Resources>
+    
+    <Border BorderBrush="{StaticResource Brush.Border2}" BorderThickness="1">
+        <Grid>
+            <Grid.RowDefinitions>
+                <RowDefinition Height="26"/>
+                <RowDefinition Height="*"/>
+            </Grid.RowDefinitions>
+            
+            <!-- Tool Bar -->
+            <Border x:Name="toolbar" Grid.Row="0" BorderBrush="{StaticResource Brush.Border2}" BorderThickness="0,0,0,1">
+                <Grid Margin="8,0">
+                    <Grid.ColumnDefinitions>
+                        <ColumnDefinition Width="Auto"/>
+                        <ColumnDefinition Width="*"/>
+                        <ColumnDefinition Width="Auto"/>
+                    </Grid.ColumnDefinitions>
+
+                    <StackPanel Grid.Column="0" x:Name="orgFileNamePanel" Orientation="Horizontal">
+                        <Path Width="10" Height="10" Data="{StaticResource Icon.File}"/>
+                        <TextBlock x:Name="txtOrgFileName" Margin="4,0,0,0" FontFamily="Consolas"/>
+                        <TextBlock Margin="8,0" Text="→" FontFamily="Consolas"/>
+                    </StackPanel>
+
+                    <StackPanel Grid.Column="1" Orientation="Horizontal">
+                        <Path Width="10" Height="10" Data="{StaticResource Icon.File}"/>
+                        <TextBlock x:Name="txtFileName" Margin="4,0" FontFamily="Consolas"/>
+                        <controls:Loading x:Name="loading" Width="10" Height="10" Visibility="Collapsed"/>
+                    </StackPanel>
+
+                    <StackPanel Grid.Column="2" x:Name="toolbarOptions" Orientation="Horizontal">
+                        <controls:IconButton
+                            Width="14" Height="14"
+                            Margin="4,0"
+                            Icon="{StaticResource Icon.Down}"
+                            ToolTip="{StaticResource Text.Diff.Next}"
+                            Click="GotoNextChange"/>
+                        
+                        <controls:IconButton
+                            Width="14" Height="14"
+                            Margin="4,0"
+                            Icon="{StaticResource Icon.Up}"
+                            ToolTip="{StaticResource Text.Diff.Prev}"
+                            Click="GotoPrevChange"/>
+
+                        <ToggleButton
+                            Width="14" Height="14"
+                            Margin="4,0,0,0"
+                            Style="{StaticResource Style.ToggleButton.SplitDirection}"
+                            Foreground="{StaticResource Brush.FG1}"
+                            ToolTip="{StaticResource Text.Diff.Mode}"
+                            IsChecked="{Binding Source={x:Static models:Preference.Instance}, Path=Window.UseCombinedDiff, Mode=TwoWay}"
+                            Checked="OnDiffViewModeChanged" Unchecked="OnDiffViewModeChanged"/>
+                    </StackPanel>
+                </Grid>
+            </Border>
+
+            <Grid x:Name="textDiff" Grid.Row="1" SizeChanged="OnTextDiffSizeChanged">
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="*"/>
+                    <ColumnDefinition Width="*"/>
+                </Grid.ColumnDefinitions>
+            </Grid>
+
+            <Border x:Name="sizeChange" Grid.Row="1">
+                <StackPanel Orientation="Vertical" VerticalAlignment="Center" TextElement.FontFamily="Consolas">
+                    <TextBlock 
+                        x:Name="txtSizeChangeTitle" 
+                        Text="{StaticResource Text.Diff.Binary}" 
+                        Margin="0,0,0,32" 
+                        FontSize="18" FontWeight="UltraBold" 
+                        Foreground="{StaticResource Brush.FG2}" 
+                        HorizontalAlignment="Center"/>
+                    
+                    <Path 
+                        x:Name="iconSizeChange" 
+                        Width="64" Height="64" 
+                        Data="{StaticResource Icon.Binary}" 
+                        Fill="{StaticResource Brush.FG2}"/>
+                    
+                    <Grid Margin="0,16,0,0" HorizontalAlignment="Center">
+                        <Grid.RowDefinitions>
+                            <RowDefinition Height="32"/>
+                            <RowDefinition Height="32"/>
+                        </Grid.RowDefinitions>
+
+                        <Grid.ColumnDefinitions>
+                            <ColumnDefinition Width="Auto"/>
+                            <ColumnDefinition Width="8"/>
+                            <ColumnDefinition Width="Auto"/>
+                        </Grid.ColumnDefinitions>
+
+                        <TextBlock Grid.Row="0" Grid.Column="0" Text="{StaticResource Text.Diff.Binary.Old}" Foreground="{StaticResource Brush.FG2}" TextElement.FontSize="18" TextElement.FontWeight="UltraBold"/>
+                        <TextBlock Grid.Row="0" Grid.Column="2" x:Name="txtOldSize" Foreground="{StaticResource Brush.FG2}" HorizontalAlignment="Right" TextElement.FontSize="18" TextElement.FontWeight="UltraBold"/>
+                        <TextBlock Grid.Row="1" Grid.Column="0" Text="{StaticResource Text.Diff.Binary.New}" Foreground="{StaticResource Brush.FG2}" TextElement.FontSize="18" TextElement.FontWeight="UltraBold"/>
+                        <TextBlock Grid.Row="1" Grid.Column="2" x:Name="txtNewSize" Foreground="{StaticResource Brush.FG2}" HorizontalAlignment="Right" TextElement.FontSize="18" TextElement.FontWeight="UltraBold"/>
+                    </Grid>
+                </StackPanel>
+            </Border>
+
+            <Border x:Name="noChange" Grid.Row="1">
+                <StackPanel Orientation="Vertical" VerticalAlignment="Center">
+                    <Path Width="64" Height="64" Data="{StaticResource Icon.Check}" Fill="{StaticResource Brush.FG2}"/>
+                    <TextBlock 
+                        Margin="0,16,0,0" 
+                        Text="{StaticResource Text.Diff.NoChange}" 
+                        FontSize="18" FontWeight="UltraBold"
+                        Foreground="{StaticResource Brush.FG2}"
+                        HorizontalAlignment="Center"/>
+                </StackPanel>
+            </Border>
+
+            <Border x:Name="mask" Grid.Row="0" Grid.RowSpan="2">
+                <StackPanel Orientation="Vertical" VerticalAlignment="Center">
+                    <Path Width="64" Height="64" Data="{StaticResource Icon.Diff}" Fill="{StaticResource Brush.FG2}"/>
+                    <TextBlock 
+                        Margin="0,16,0,0" 
+                        Text="{StaticResource Text.Diff.Welcome}" 
+                        FontSize="18" FontWeight="UltraBold" 
+                        Foreground="{StaticResource Brush.FG2}"
+                        HorizontalAlignment="Center"/>
+                </StackPanel>
+            </Border>
+        </Grid>
+    </Border>
+</UserControl>