Merge pull request #24 from Techsola/fix_path_mapping_for_recursive_branching

Fix path mapping for recursive branching

Author: jnm2

src/TfvcMigrator/Program.cs

@@ -485,7 +485,9 @@ private static async IAsyncEnumerable<MappingState> EnumerateMappingStatesAsync(
 
                             mapping = PathUtils.IsOrContains(branch.SourceBranchPath, mapping.RootDirectory)
                                 ? mapping.ApplyRename(branch.SourceBranchPath, branch.NewBranch.Path)
-                                : mapping.WithSubdirectoryMapping(branch.NewBranch.Path, branch.SourceBranchPath);
+                                : mapping.WithSubdirectoryMapping(
+                                    branch.NewBranch.Path,
+                                    mapping.SubdirectoryMapping?.TargetDirectory ?? branch.SourceBranchPath);
 
                             branchMappings.Add(branch.NewBranch, mapping);
                             break;