Suggestion: A fringe indicator that shows the last/first line before scrolling

[Tassilo Horn]

Hi,

when I scroll a large document with C-v (scroll-up) / M-v (scroll-down)
I often have a hard time to spot the line where I was reading.  I think
it would be much easier to find that place, if there was some indicator
in the fringe that shows the first/last line that was visible before the
scrolling command was performed.

If you scroll up (i.e. with C-v) it shows the last visible line before
the scroll, if you scroll down (i.e. with M-v) it shows the first.

What do you think?

Bye,
Tassilo