Reduce noisy errors when viewing git diff on VS code

src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/UriExtensions.cs

@@ -3,6 +3,7 @@
 
 using System;
 using System.Net;
+using Microsoft.AspNetCore.Razor.Utilities;
 
 namespace Microsoft.CodeAnalysis.Razor;
 
@@ -22,6 +23,27 @@ public static string GetAbsoluteOrUNCPath(this Uri uri)
         }
 
         // Absolute paths are usually encoded.
-        return uri.AbsolutePath.Contains("%") ? WebUtility.UrlDecode(uri.AbsolutePath) : uri.AbsolutePath;
+        var absolutePath = uri.AbsolutePath.Contains("%") ? WebUtility.UrlDecode(uri.AbsolutePath) : uri.AbsolutePath;
+
+        if (uri.Scheme.ToLower() == "git")
+        {
+            // return a normalized path when we want to add to a fake git directory path (hacky fix for https://github.com/dotnet/razor/issues/9365)
+            return AddToFakeGitDirectoryAtRoot(absolutePath);
+        }
+
+        return absolutePath;
+    }
+
+    private static string AddToFakeGitDirectoryAtRoot(string decodedAbsolutePath)
+    {
+        var normalizedPath = FilePathNormalizer.Normalize(decodedAbsolutePath);
+        var firstSeparatorIndex = normalizedPath.IndexOf('/');
+        if (firstSeparatorIndex < 0)
+        {
+            // no-op
+            return decodedAbsolutePath;
+        }
+
+        return normalizedPath[..(firstSeparatorIndex + 1)] + "_git_" + normalizedPath[firstSeparatorIndex..];
     }
 }

src/Razor/test/Microsoft.CodeAnalysis.Razor.Workspaces.Test/UriExtensionsTest.cs

@@ -93,4 +93,17 @@ public void GetAbsoluteOrUNCPath_UNCPath_HandlesSpacePaths()
         // Assert
         Assert.Equal(@"\\some\path\to\file path.cshtml", path);
     }
+
+    [Fact, WorkItem("https://github.com/dotnet/razor/issues/9365")]
+    public void GetAbsoluteAndUNCPath_HasGitScheme_ReturnsANormalizedFakeGitFilePath()
+    {
+        // Arrange
+        var uri = new Uri("git:/c%3A/myFolder/Index.cshtml?%7B%22path%22%3A%22c%3A%5C%5CmyFolder%5C%5CIndex.cshtml%22%2C%22ref%22%3A%22~%22%7D");
+
+        // Act
+        var path = uri.GetAbsoluteOrUNCPath();
+
+        // Assert
+        Assert.Equal("c:/_git_/myFolder/Index.cshtml", path);
+    }
 }