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rio: flushimage() before wscrsleep()

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

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

@@ -97,6 +97,8 @@

 	int y, b;

 	static Alt alts[3];

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

+		flushimage(display, 1);

 	timer = timerstart(dt);

 	y = w->mc.xy.y;

 	b = w->mc.buttons;