bug#36839: 26.1: unique frame names

[Boruch Baum]

Subject: 26.1; unique frame names

By default, emacs creates frames with unique names, in the form "Fnn".
Emacs also offers a documented variable `default-frame-alist', which one
can use to customize frame parameters, one of which is NAME. However, I
don't see documented anywhere how to specify that frame names should be
unique, and when setting the NAME parameter, all new frames are created with
identical names:

   (setq default-frame-alist '((name . "Frame_%")))

My attempt to trace the code ended with `make-terminal-frame', a
built-in function in ‘src/frame.c’, since I don't have that source file handy.

My expectation is that emacs should by default create frames with unique
names, similar to how it uniquely names buffers, by appending a number
to what would otherwise be a duplicate name.

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