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nusb/kb: *really* only send to mousein when mouse state actually changes (zero detlas, same buttons)

--- a/sys/src/cmd/nusb/kb/kb.c

+++ b/sys/src/cmd/nusb/kb/kb.c

@@ -459,7 +459,7 @@

 {

 	char	err[ERRMAX];

 	char	mbuf[80];

-	int	c, b, nerrs;

+	int	c, b, nerrs, lastb;

 	KDev*	f = a;

 	Ptr	p;

@@ -467,6 +467,7 @@

 	sethipri();

 	memset(&p, 0, sizeof(p));

+	lastb = 0;

 	nerrs = 0;

 	for(;;){

@@ -507,6 +508,10 @@

 			b |= 4;

 		if(p.z != 0)

 			b |= (p.z > 0) ? 8 : 16;

+

+		if(p.x == 0 && p.y == 0 && p.z == 0 && b == lastb)

+			continue;

+		lastb = b;

 		seprint(mbuf, mbuf+sizeof(mbuf), "m%11d %11d %11d", p.x, p.y, b);

 		if(write(f->infd, mbuf, strlen(mbuf)) < 0)

-- 

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