When you use IFileOperation to rename a directory that matches the name of another directory it offers to merge. If you choose yes, it merges but no indication of the fact that it merged with another one. Is there an easy way to tell?
You can tell it to rename on collision but it doesn't ask, it just does it. Is there a way for it to ask if wants a new name vs merge?
When you rename a file that conflicts with another, it doesn't offer user a choice, it just errors out. See this link for details