Option to save scrolling line status

[ABuffEr]

Hi,
I'd like to suggest an option to save the current scrolling line position (from 41 to 80, for example, with a 40-cells display and over a line of 100 characters), even if the routing cursor is not placed in current char range.
Actually, switching to another window resets the display to initial line position, forcing the user to scroll again.
It would be particularly useful when working with text editors, and comparing two documents. So, maybe, it could be limited to text edit controls.