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libdraw: avoid dropping queued button change mouse events in emouse()

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

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

@@ -380,7 +380,7 @@

 {

 	Mouse m;

 	Ebuf *eb;

-	static but[2];

+	static int lastb;

 	int b;

 	if(Smouse < 0)

@@ -387,14 +387,15 @@

 		drawerror(display, "events: mouse not initialized");

 	for(;;){

 		eb = ebread(&eslave[Smouse]);

-		if(!ecanmouse())

+		b = atoi((char*)eb->buf+1+2*12);

+		if(b != lastb || !ecanmouse())

 			break;

 		free(eb);	/* drop queued mouse events */

 	}

+	lastb = b;

+	m.buttons = b;

 	m.xy.x = atoi((char*)eb->buf+1+0*12);

 	m.xy.y = atoi((char*)eb->buf+1+1*12);

-	b = atoi((char*)eb->buf+1+2*12);

-	m.buttons = b;

 	m.msec = atoi((char*)eb->buf+1+3*12);

 	if (logfid)

 		fprint(logfid, "b: %d xy: %P\n", m.buttons, m.xy);