enhance: Ignore Whitespace Changes button is only visible for text diff

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

Author: love-linger

src/ViewModels/DiffContext.cs

@@ -25,6 +25,12 @@ public bool IsTextDiff
             private set => SetProperty(ref _isTextDiff, value);
         }
 
+        public bool IsIgnoreWhitespaceVisible
+        {
+            get => _isIgnoreWhitespaceVisible;
+            private set => SetProperty(ref _isIgnoreWhitespaceVisible, value);
+        }
+
         public object Content
         {
             get => _content;
@@ -45,6 +51,7 @@ public DiffContext(string repo, Models.DiffOption option, DiffContext previous =
             if (previous != null)
             {
                 _isTextDiff = previous._isTextDiff;
+                _isIgnoreWhitespaceVisible = previous._isIgnoreWhitespaceVisible;
                 _content = previous._content;
                 _fileModeChange = previous._fileModeChange;
                 _unifiedLines = previous._unifiedLines;
@@ -236,6 +243,7 @@ private void LoadContent()
                     if (rs is Models.TextDiff cur)
                     {
                         IsTextDiff = true;
+                        IsIgnoreWhitespaceVisible = true;
 
                         if (Preferences.Instance.UseSideBySideDiff)
                             Content = new TwoSideTextDiff(_option, cur, _content as TextDiffContext);
@@ -245,6 +253,7 @@ private void LoadContent()
                     else
                     {
                         IsTextDiff = false;
+                        IsIgnoreWhitespaceVisible = (rs is Models.NoOrEOLChange);
                         Content = rs;
                     }
                 });
@@ -323,6 +332,7 @@ public bool IsSame(Info other)
         private string _fileModeChange = string.Empty;
         private int _unifiedLines = 4;
         private bool _isTextDiff = false;
+        private bool _isIgnoreWhitespaceVisible = true;
         private object _content = null;
         private Info _info = null;
     }

src/Views/DiffView.axaml

@@ -183,6 +183,7 @@
             <ToggleButton Classes="line_path"
                           Width="28"
                           IsChecked="{Binding Source={x:Static vm:Preferences.Instance}, Path=IgnoreWhitespaceChangesInDiff, Mode=TwoWay}"
+                          IsVisible="{Binding IsIgnoreWhitespaceVisible, Mode=OneWay}"
                           ToolTip.Tip="{DynamicResource Text.Diff.IgnoreWhitespace}"
                           PropertyChanged="OnToggleButtonPropertyChanged">
               <Path Width="14" Height="14" Stretch="Uniform" Data="{StaticResource Icons.Whitespace}"/>