refactor: remove duplicate ObjectConverters, remove unused using

Author: gadfly3173

src/Converters/ObjectConverters.cs

@@ -8,7 +8,6 @@
 using Avalonia.Threading;
 
 using CommunityToolkit.Mvvm.ComponentModel;
-using SourceGit.Models;
 
 namespace SourceGit.ViewModels
 {
@@ -74,10 +73,7 @@ public Models.FileModeDiff FileModeDiff
             set => SetProperty(ref _fileModeDiff, value);
         }
 
-        public TextTrimming PathTrimming
-        {
-            get => _pathTrimming;
-        }
+        public TextTrimming PathTrimming { get; } = new TextLeadingPrefixTrimming("...", 20);
 
         public DiffContext(string repo, Models.DiffOption option, DiffContext previous = null)
         {
@@ -199,6 +195,5 @@ private Bitmap BitmapFromRevisionFile(string repo, string revision, string file)
         private object _content = null;
         private Vector _syncScrollOffset = Vector.Zero;
         private Models.FileModeDiff _fileModeDiff = null;
-        private TextTrimming _pathTrimming = new TextLeadingPrefixTrimming("...", 20);
     }
 }

src/ViewModels/DiffContext.cs

@@ -27,7 +27,7 @@
             <Path DockPanel.Dock="Right" Classes="rotating" Width="10" Height="10" Margin="8,0" Data="{StaticResource Icons.Loading}" IsVisible="{Binding IsLoading}"/>
           </DockPanel>
 
-          <StackPanel Grid.Column="2" Orientation="Horizontal" VerticalAlignment="Center" IsVisible="{Binding FileModeDiff, Converter={x:Static c:ObjectConverters.IsNotNull}}">
+          <StackPanel Grid.Column="2" Orientation="Horizontal" VerticalAlignment="Center" IsVisible="{Binding FileModeDiff, Converter={x:Static ObjectConverters.IsNotNull}}">
             <TextBlock Classes="monospace" Margin="8,0,0,0" Text="{DynamicResource Text.Diff.FileModeChanged}" FontSize="11"/>
             <TextBlock Classes="monospace" Text="{Binding FileModeDiff.Old}" FontSize="11"/>
             <TextBlock Margin="4,0" Text="→"/>