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Possibly what is called for is a "second-level" point-pdl, which
doesn't accumulate garbage due to local editing; commands like search
and region-marking would use the first-level point-pdl, edit-definition
and friends (and an explicit command) would push on both.  Then a
command to pop the second-level point pdl (as a ring rather than as
a stack so you don't lose anything) would get you back to the last
important place.  There should also be a command to get you a menu of
second-level point-pdl entries, with each one showing the line point is
on and a name such as the arg to meta-.

Does this sound reasonable to anyone?