[O] possible point placement bug with multiple frames and visibility change

[Samuel Wales]

when i create a new frame,
go to an ancestor of point,
cycle visibility to collapse the entry,
and kill the new frame,
i expect the old frame's point to still be where it was.

instead, it moves to the ancestor of point.

shouldn't point remain inside the invisible region?  point can be
different in different windows.  visibility status, i'm not sure.

i use new frames to remember where i was and switch back and
forth.


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