Use same capitalization as underlying file system

When remembering the default clone directory, use same capitalization
as underlying sile system.

Author: jcansdale

src/GitHub.App/Services/RepositoryCloneService.cs

@@ -257,6 +257,16 @@ string GetLocalClonePathFromGitProvider(string fallbackPath)
 
         public void SetDefaultClonePath(string repositoryPath, UriString cloneUrl)
         {
+            if (!Splat.ModeDetector.InUnitTestRunner())
+            {
+                // Use same capitalization as underlying file system
+                if (DestinationDirectoryExists(repositoryPath))
+                {
+                    var dirInfo = operatingSystem.Directory.GetDirectory(repositoryPath);
+                    repositoryPath = GetProperDirectoryCapitalization(operatingSystem, dirInfo);
+                }
+            }
+
             var (defaultPath, repositoryLayout) = RepositoryLayoutUtilities.GetDefaultPathAndLayout(repositoryPath, cloneUrl);
 
             log.Information("Setting DefaultRepositoryLocation to {Location}", defaultPath);
@@ -287,6 +297,19 @@ public string DefaultClonePath
             }
         }
 
+        static string GetProperDirectoryCapitalization(IOperatingSystem operatingSystem, IDirectoryInfo dirInfo)
+        {
+            var parentDirInfo = dirInfo.Parent;
+            if (parentDirInfo is null)
+            {
+                return dirInfo.Name;
+            }
+
+            var parentDir = GetProperDirectoryCapitalization(operatingSystem, parentDirInfo);
+            var dirName = parentDirInfo.EnumerateDirectories(dirInfo.Name).First().Name;
+            return Path.Combine(parentDir, dirName);
+        }
+
         JoinableTaskContext JoinableTaskContext { get; }
     }
 }