set_mouse_topline(win_T *wp)
{
    orig_topline = wp->w_topline;
# ifdef FEAT_DIFF
    orig_topfill = wp->w_topfill;
# endif
}
set_mouse_topline(win_T *wp)
{
    orig_topline = wp->w_topline;
# ifdef FEAT_DIFF
    orig_topfill = wp->w_topfill;
# endif
}