I see that the commands C-" and C-/ scrolls line but keeps the current line the same, so it disappears off screen if you scroll up down too far, and then if you use UP Down or similar navigation commands the screen jumps back to the current line.

I want a scroll line that keeps the current line at the same position on the screen, meaning if I scoll one line up, the current line also move one line up. Just like C-Up is done in NP++ and Cream.