previous-history-element could skip repeats

[Dan Jacobson]

"ESC p runs the command previous-history-element" OK, but might it be
smart to skip the previous history element if it is the same as the
current history element, as a new option on by default.

For instance, I did 20 M-x compile's in a row.  Now after hitting C-x
ESC ESC I would need 20 ESC p's to get past all that to reach
something interesting.

[Wonder what bash does about this with C-p.]
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