When I scroll a whole page up by
ctrl-f, and down by
ctrl-b, vim reserves 2 lines, and repeats them both in the previous GUI window and the present one.
But I expect it not to repeat lines, because now that the "turning" of pages is not a really "turning" but with a small shift, this makes me harder to visualize the new position which it is.
That is to say, if line 1 to line 30 is shown in present window, and to simplify matters suppose none is wrapped, then when I press
ctrl-f, the subsequent GUI window will display line 29 to 58.
But I want it to show line 31 to 60, and so on. What should I set in