If I open a 2nd code window in the IDE and add some lines to or remove lines from the bottom window, then if the top window comes after the bottom one in the code, it will scroll. I suspect that only rarely, if ever, does someone WANT it to scroll. Usually you want to continue to see the code which you brought up in the window. (Of course, the same goes for changing code in the top window and wanting the bottom window to stay where it is.)