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rio: add scroll lock key to toggle scroll mode

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

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

@@ -665,6 +665,10 @@

 		case Kend:

 			wshow(w, w->nr);

 			return;

+		case Kscroll:

+			w->scrolling ^= 1;

+			wshow(w, w->nr);

+			return;

 		case Ksoh:	/* ^A: beginning of line */

 			if(w->q0==0 || w->q0==w->qh || w->r[w->q0-1]=='\n')

 				return;