enhance: disable AllowScrollBelowDocument option for text diff view (#1801)

Signed-off-by: leo <[email protected]>

Author: love-linger

src/Views/TextDiffView.axaml.cs

@@ -478,6 +478,7 @@ public ThemedTextDiffPresenter(TextArea area, TextDocument doc) : base(area, doc
             Options.EnableHyperlinks = false;
             Options.EnableEmailHyperlinks = false;
             Options.ShowEndOfLine = false;
+            Options.AllowScrollBelowDocument = false;
 
             _lineStyleTransformer = new LineStyleTransformer(this);