fix: Address review

Co-authored-by: Daniel Peñalba <daniel.penalba@unity3d.com>

src/AvaloniaEdit.TextMate/TextEditorModel.cs

@@ -168,7 +168,9 @@ namespace AvaloniaEdit.TextMate
 
             try
             {
-                InvalidateLineRange(_invalidRange.StartLine < _documentSnapshot.LineCount ? _invalidRange.StartLine : _document.LineCount - 1, _invalidRange.EndLine < _documentSnapshot.LineCount ? _invalidRange.EndLine : _documentSnapshot.LineCount - 1);
+    int startLine = Math.Clamp(_invalidRange.StartLine, 0, _documentSnapshot.LineCount - 1);
+    int endLine = Math.Clamp(_invalidRange.EndLine, 0, _documentSnapshot.LineCount - 1);
+    InvalidateLineRange(startLine, endLine);
             }
             finally
             {