948     int		extra;		// offset for first screen line  in curs_columns()  local
988     extra = curwin_col_off();  in curs_columns()
989     curwin->w_wcol = curwin->w_virtcol + extra;  in curs_columns()
990     endcol += extra;  in curs_columns()
997     textwidth = curwin->w_width - extra;  in curs_columns()
1064 		new_leftcol = curwin->w_wcol - extra - textwidth / 2;  in curs_columns()
1125 	extra = 0;  in curs_columns()
1127 	    extra = 1;  in curs_columns()
1138 	    extra += 2;  in curs_columns()
1140 	if (extra == 3 || p_lines <= so * 2)  in curs_columns()
1153 	else if (extra == 1)  in curs_columns()
1156 	    extra = (curwin->w_skipcol + so * width - curwin->w_virtcol  in curs_columns()
1158 	    if (extra > 0)  in curs_columns()
1160 		if ((colnr_T)(extra * width) > curwin->w_skipcol)  in curs_columns()
1161 		    extra = curwin->w_skipcol / width;  in curs_columns()
1162 		curwin->w_skipcol -= extra * width;  in curs_columns()
1165 	else if (extra == 2)  in curs_columns()
1179 	    extra = curwin->w_wrow - curwin->w_height + 1;  in curs_columns()
1180 	    curwin->w_skipcol += extra * width;  in curs_columns()
1181 	    curwin->w_wrow -= extra;  in curs_columns()
1184 	extra = ((int)prev_skipcol - (int)curwin->w_skipcol) / width;  in curs_columns()
1185 	if (extra > 0)  in curs_columns()
1186 	    win_ins_lines(curwin, 0, extra, FALSE, FALSE);  in curs_columns()
1187 	else if (extra < 0)  in curs_columns()
1188 	    win_del_lines(curwin, 0, -extra, FALSE, FALSE, 0);  in curs_columns()
1784     int		extra = 0;  in scroll_cursor_top()  local
1829     extra += diff_check_fill(curwin, curwin->w_cursor.lnum);  in scroll_cursor_top()
1846 	if (extra + i <= off && bot < curbuf->b_ml.ml_line_count)  in scroll_cursor_top()
1865 		&& extra >= off)  in scroll_cursor_top()
1868 	extra += i;  in scroll_cursor_top()
1893 	if (curwin->w_topfill > 0 && extra > off)  in scroll_cursor_top()
1895 	    curwin->w_topfill -= extra - off;  in scroll_cursor_top()
1954     int		extra = 0;  in scroll_cursor_bot()  local
2047 		    && extra >= (mouse_dragging > 0 ? mouse_dragging - 1 : so))  in scroll_cursor_bot()
2089 	    if (extra < ( mouse_dragging > 0 ? mouse_dragging - 1 : so)  in scroll_cursor_bot()
2092 		extra += boff.height;  in scroll_cursor_bot()