Select correct information when merging contacts

Sometimes two versions of a contact (e.g. local and LinkedIn) have different information (e.g. photo, email, etc.). Merging currently replaces one set of information, with no opportunity to choose which information remains.

It would be great if, when merging, any conflicting fields were highlighted (e.g., both photos) and the user was given the opportunity to choose which information to keep in that field for the merged contact.