From 28f645a9fff9494de5b69df18b50434c39297c96 Mon Sep 17 00:00:00 2001
From: Matt Thalman <mthalman@microsoft.com>
Date: Thu, 22 Feb 2024 08:30:36 -0600
Subject: [PATCH] Use Distinct

---
 .../content/repo-projects/Directory.Build.targets          | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/SourceBuild/content/repo-projects/Directory.Build.targets b/src/SourceBuild/content/repo-projects/Directory.Build.targets
index 2677db09128c..df5ce45b942e 100644
--- a/src/SourceBuild/content/repo-projects/Directory.Build.targets
+++ b/src/SourceBuild/content/repo-projects/Directory.Build.targets
@@ -726,11 +726,10 @@
     <!-- When items are transferred between projects, they get metadata indicating their source (e.g. MSBuildSourceProjectFile).
          This is problematic because it causes introduces distinctness on the items. For example, an arcade RepositoryReference
          that comes from both msbuild and source-build-externals will be treated as two separate items. But we only want one arcade
-         reference. To prevent this from happening, we need to remove the extra metadata so the two references can be seen as duplicates. -->
+         reference. To prevent this from happening, use the Distinct method which operates on just the Identity to get a unique set
+         of values. -->
     <ItemGroup>
-      <_TransitiveRepositoryReference Include="@(_DependencyTransitiveRepositoryReference)"
-                                      RemoveMetadata="MSBuildSourceProjectFile;MSBuildSourceTargetName;OriginalItemSpec" />
-      <TransitiveRepositoryReference Include="@(_TransitiveRepositoryReference)" KeepDuplicates="false" />
+      <TransitiveRepositoryReference Include="@(_DependencyTransitiveRepositoryReference->Distinct())" />
     </ItemGroup>
 
     <!-- Exclude repositories that currently don't build when not building source-only. -->