[release/9.0.1xx-preview7] Remove the 'Resources' prefix from BundleR…

…esource (#24024)

* Remove the 'Resources' prefix from BundleResource

Fixes #23554

Prior to Maui 8.0.70, there was a bug that only removed the "Resources/" prefix, and not the correct "Platforms/iOS/Resource": #16734

This PR #23269 fixes the original issue, but now exposed the case where BundleResource were included in the root Resources folder instead of the Platforms/iOS/ folder.

* Update Microsoft.Maui.Controls.SingleProject.targets

* Update Microsoft.Maui.Controls.SingleProject.targets

* Add a test

* string

---------

Co-authored-by: Matthew Leibowitz <mattleibow@live.com>

src/Controls/src/Build.Tasks/nuget/buildTransitive/netstandard2.0/Microsoft.Maui.Controls.SingleProject.targets

@@ -61,6 +61,24 @@
 
   </Target>
 
+  <!--
+    TEMPORARY workaround for the issue where the resource starts with the Resources/ prefix,
+    either in the Identity or Link metadata. The fix is to assume that was not intended
+    since that is how it worked in 8.0.60 and earlier.
+    See: https://github.com/xamarin/xamarin-macios/issues/20968
+  -->
+  <Target Name="_MauiBefore_CollectBundleResources" BeforeTargets="_CollectBundleResources">
+    <PropertyGroup>
+      <_MauiOld_ResourcePrefix>$(_ResourcePrefix)</_MauiOld_ResourcePrefix>
+      <_ResourcePrefix>Resources;$(_ResourcePrefix)</_ResourcePrefix>
+    </PropertyGroup>
+  </Target>
+  <Target Name="_MauiAfter_CollectBundleResources" AfterTargets="_CollectBundleResources">
+    <PropertyGroup>
+      <_ResourcePrefix>$(_MauiOld_ResourcePrefix)</_ResourcePrefix>
+    </PropertyGroup>
+  </Target>
+
   <!-- Import Maui Single Project property pages -->
   <PropertyGroup Condition="'$(MauiDesignTimeTargetsPath)' == ''">
     <MauiDesignTimeTargetsPath>$(MSBuildExtensionsPath)\Microsoft\VisualStudio\Maui\Maui.DesignTime.targets</MauiDesignTimeTargetsPath>

src/TestUtils/src/Microsoft.Maui.IntegrationTests/TemplateTests.cs

@@ -342,6 +342,37 @@ public void BuildWindowsRidGraph(string id, bool useridgraph, string packageType
 				$"Project {Path.GetFileName(projectFile)} failed to build. Check test output/attachments for errors.");
 		}
 
+		[Test]
+		[TestCase("maui", "ios")]
+		[TestCase("maui", "maccatalyst")]
+		[TestCase("maui-blazor", "ios")]
+		[TestCase("maui-blazor", "maccatalyst")]
+		public void BuildWithCustomBundleResource(string id, string framework)
+		{
+			var projectDir = TestDirectory;
+			var projectFile = Path.Combine(projectDir, $"{Path.GetFileName(projectDir)}.csproj");
+
+			Assert.IsTrue(DotnetInternal.New(id, projectDir, DotNetCurrent),
+				$"Unable to create template {id}. Check test output for errors.");
+
+			File.WriteAllText(Path.Combine(projectDir, "Resources", "testfile.txt"), "Something here :)");
+
+			FileUtilities.ReplaceInFile(projectFile,
+				"</Project>",
+				$"""
+				  <ItemGroup>
+				    <BundleResource Include="Resources\testfile.txt" />
+				  </ItemGroup>
+				</Project>
+				""");
+
+			var extendedBuildProps = BuildProps;
+			extendedBuildProps.Add($"TargetFramework={DotNetCurrent}-{framework}");
+
+			Assert.IsTrue(DotnetInternal.Build(projectFile, "Debug", properties: extendedBuildProps, msbuildWarningsAsErrors: true),
+				$"Project {Path.GetFileName(projectFile)} failed to build. Check test output/attachments for errors.");
+		}
+
 		[Test]
 		[TestCase("maui", $"{DotNetCurrent}-ios", "ios-arm64")]
 		[TestCase("maui", $"{DotNetCurrent}-ios", "iossimulator-arm64")]