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vt: but not too fast :-)

if drawing can't keep up with the host, make sure we
eventually redraw the screen and check for user events.

--- a/sys/src/cmd/vt/main.c

+++ b/sys/src/cmd/vt/main.c

@@ -645,7 +645,7 @@

 				return(rcvchar());

 			free(hostbuf);

 			hostbufp = hostbuf = nbrecvp(hc);

-			if(host_avail())

+			if(host_avail() && nrand(8))

 				return(rcvchar());

 		}

 		drawscreen();

@@ -662,10 +662,13 @@

 		{ mc->c, &mc->Mouse, CHANRCV },

 		{ mc->resizec, nil, CHANRCV },

 		{ kc->c, &kbdchar, CHANRCV },

-		{ hc, &hostbuf, CHANNOP },

+		{ hc, &hostbuf, CHANRCV },

 		{ nil, nil, CHANEND },

 	};

-	if(hostbuf == nil) a[AHOST].op = CHANRCV;

+	if(blocked)

+		a[AHOST].op = CHANNOP;

+	else if(hostbuf != nil)

+		a[AHOST].op = CHANNOBLK;

 Next:

 	if(display->bufp > display->buf)

 		flushimage(display, 1);

-- 

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