use chatwait for responsive streaming in sh and acme frontends

9p

@@ -1 +1 @@
-Subproject commit 77c20cf43dfc723a6f39d73920faf8d3360e4839
+Subproject commit 46c57923ec32bd46212abab786b5cb9afc2d7538

acme

@@ -1 +1 @@
-Subproject commit f4e844b0a645542127ccf16eeeaef8e8d4f1f74f
+Subproject commit b46f2c92b84c1935c1adecd311d48e9c555db8e7

scripts/s/sh

@@ -277,20 +277,7 @@ done; exit 1'}
 			cat $S/statewait >/dev/null >[2]/dev/null
 
 			while(! is_idle) {
-				n=`{wc -c < $S/chat >[2]/dev/null}
-				if(~ $#n 0) n=0
-				if(test $n -gt $chat_off) {
-					tail -c +`{expr $chat_off + 1} $S/chat
-					chat_off=$n
-				}
-				sleep 0.05
-			}
-
-			n=`{wc -c < $S/chat >[2]/dev/null}
-			if(~ $#n 0) n=0
-			if(test $n -gt $chat_off) {
-				tail -c +`{expr $chat_off + 1} $S/chat
-				chat_off=$n
+				cat $S/chatwait
 			}
 			printf '\n'
 	}