MARGIN_IN_LINES  6283 src/window.c         int this_scroll_margin = window_scroll_margin (w, MARGIN_IN_LINES);
MARGIN_IN_LINES  6704 src/window.c     this_scroll_margin = window_scroll_margin (w, MARGIN_IN_LINES);
MARGIN_IN_LINES  6967 src/window.c         this_scroll_margin = window_scroll_margin (w, MARGIN_IN_LINES);
MARGIN_IN_LINES  19774 src/xdisp.c      margin = window_scroll_margin (w, MARGIN_IN_LINES);