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libdraw: don't redraw input box in enter/eenter when mouse is moved outside the rectangle

prevents some flickering when devdraw is used over a high latency connection.

Fixes issue 236

--- a/sys/src/libdraw/eenter.c

+++ b/sys/src/libdraw/eenter.c

@@ -111,6 +111,7 @@

 		sc = b->clipr;

 		replclipr(b, 0, b->r);

+nodraw:

 		switch(i){

 		default:

 			done = 1;

@@ -187,7 +188,7 @@

 			*m = ev.mouse;

 			if(!ptinrect(m->xy, r)){

 				down = 0;

-				continue;

+				goto nodraw;

 			}

 			if(m->buttons & 7){

 				down = 1;

--- a/sys/src/libdraw/enter.c

+++ b/sys/src/libdraw/enter.c

@@ -120,6 +120,7 @@

 		}

 		flushimage(display, 1);

+nodraw:

 		switch(alt(a)){

 		case -1:

 			done = 1;

@@ -194,7 +195,7 @@

 		case 1:

 			if(!ptinrect(m.xy, r)){

 				down = 0;

-				continue;

+				goto nodraw;

 			}

 			if(m.buttons & 7){

 				down = 1;