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rio: remove more unneccesary flushimage() calls

--- a/sys/src/cmd/rio/rio.c

+++ b/sys/src/cmd/rio/rio.c

@@ -820,7 +820,6 @@

 		break;

 	}

 	wsendctlmesg(w, Wakeup, ZR, nil);

-	flushimage(display, 1);

 }

 Point

--- a/sys/src/cmd/rio/scrl.c

+++ b/sys/src/cmd/rio/scrl.c

@@ -133,7 +133,6 @@

 	oldp0 = ~0;

 	first = TRUE;

 	do{

-		flushimage(display, 1);

 		my = w->mc.xy.y;

 		if(my < s.min.y)

 			my = s.min.y;

@@ -165,7 +164,8 @@

 		oldp0 = p0;

 		/* debounce */

 		if(first){

-			flushimage(display, 1);

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

+				flushimage(display, 1);

 			if(but > 3)

 				return;

 			sleep(200);

--- a/sys/src/cmd/rio/wind.c

+++ b/sys/src/cmd/rio/wind.c

@@ -432,7 +432,7 @@

 			freecompletion(cr);

 			break;

 		}

-		if(w->i!=nil && Dx(w->screenr) > 0)

+		if(w->i!=nil && Dx(w->screenr) > 0 && display->bufp > display->buf)

 			flushimage(display, 1);

 	}

 }

@@ -1126,8 +1126,8 @@

 		w->screenr = r;

 		strcpy(buf, w->name);

 		wresize(w, i);

-		proccreate(deletetimeoutproc, estrdup(buf), 4096);

 		flushimage(display, 1);

+		proccreate(deletetimeoutproc, estrdup(buf), 4096);

 		if(Dx(r)<=0){	/* window got hidden, if we had the input, drop it */

 			if(w==input)

 				input = nil;