[GRASS5] v.digit zoom menu - unnecessary redraw

[cheg01 at attbi.com]

I noticed that in the zoom menu under v.digit is:

switch (button)
{
    case LEFTB:
            set_window_w_mouse ();
            clear_window();
            replot(CMap);
            ....
It clears and redraws the map after a right click to leave the
set_window_w_mouse submenu. This appears to be unnecessary because the
screen is either already refreshed or nothing has changed when these lines
are executed. Unless I am missing someting, we can save unnecessary
graphics redisplay time by commenting out lines 679-690 in window.c (line
numbers from ver 1.7).

/* clear_window();
replot(CMap); */