Ignoring whitespaces on diff does not work

Expected behavior

When I call:

  var options =
                new CompareOptions()
                {
                    ContextLines = Int32.MaxValue,
                    IncludeUnmodified = true,
                    Similarity =
                        new SimilarityOptions()
                        {
                            WhitespaceMode = WhitespaceMode.IgnoreAllWhitespace
                        }
                };

Console.Write(
   repo.Diff.Compare<Patch>(
      branch.Tip.Tree, 
      DiffTargets.Index | DiffTargets.WorkingDirectory, 
      files,
      null,
      options
   ).First().Patch
)

the output is the same as using the git command git diff --ignore-all-space:

diff --git a/test.txt b/test.txt
index d209983..b2c9980 100644
--- a/test.txt
+++ b/test.txt
@@ -1,2 +1,2 @@
 I am an  initial  content
-I am a changeable content
\ No newline at end of file
+I am a different content
\ No newline at end of file

Actual behavior

If have a file "test.txt" with committed content:

I am an inital content
I am a changeable content

and uncommitted content:

I am an  inital  content
I am a different content

(The first line has some additional whitespaces)

When I call:

  var options =
                new CompareOptions()
                {
                    ContextLines = Int32.MaxValue,
                    IncludeUnmodified = true,
                    Similarity =
                        new SimilarityOptions()
                        {
                            WhitespaceMode = WhitespaceMode.IgnoreAllWhitespace
                        }
                };

Console.Write(
   repo.Diff.Compare<Patch>(
      branch.Tip.Tree, 
      DiffTargets.Index | DiffTargets.WorkingDirectory, 
      files,
      null,
      options
   ).First().Patch
)

the output is

diff --git a/test.txt b/test.txt
index d209983..b2c9980 100644
--- a/test.txt
+++ b/test.txt
@@ -1,2 +1,2 @@
-I am an initial content
-I am a changeable content
\ No newline at end of file
+I am an  initial  content
+I am a different content
\ No newline at end of file

Version of LibGit2Sharp (release number or SHA1)

v0.26.2

Operating system(s) tested; .NET runtime tested

Comienza reproduciendo el ejemplo de Compare con CompareOptions, SimilarityOptions y WhitespaceMode.IgnoreAllWhitespace; después, compara su salida con git diff --ignore-all-space. Sigue la ruta de comparación de diffs que gestiona los modos de Whitespace. Se considera terminado cuando se ignoran los cambios que solo afectan al Whitespace, mientras que los cambios sustantivos siguen apareciendo en el patch.