Note that creating a new file (cmd-N) and typing in a name for it also generates a “Successfully renamed file.” message - which I’m sure is technically true (since it was created as “Untitled x” and renamed when the user types in its name), but it does look odd from a UI perspective.
As a user, I would probably expect that message to be suppressed if the file is renamed before the input focus leaves the file name field.
(In other words, if I create a new file, type some content, then go back and change its name, the rename message would be expected; creating a new file, immediately typing its name in the highlighted input box [the file name box], and then hitting e.g. tab to edit it, the message seems a bit non sequitur.)
