add a command that moves you to the last place you were editing

[Dan Jacobson]

Fellas, there might be a need for:
A command that moves you to the last place you were editing in the
current buffer.

Why: let's say, oh I'm editing and I, um, use some C-v's etc. to move
around the buffer, and, OK, I want to go back to where I was editing,
and I, you know, hit some C-x C-x's thinking, naturally, that I might
have set a mark there or something before going roaming... but
naturally, no, sorry... so where was I [in that buffer]?

OK, being not a simple guy, I know to hit C-/ C-f C-/
[C-_ C-f C-_] [undo, something else, undo].  But: this feels
uncomfortable... an over reaction one might say, therefore perhaps
emacs is missing my above recommended addition, eh?
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