$NetBSD$

Disable Scroll Lock-specific behavior in the alternate screen.
This makes visual programs like vi (that make use of the alternate
screen) behave normally even if Scroll Lock is active.

--- util.c.orig	2018-03-14 06:04:22.000000000 +0000
+++ util.c
@@ -570,7 +570,7 @@ xtermScroll(XtermWidget xw, int amount)
 	amount = i;
 
 #if OPT_SCROLL_LOCK
-    if (screen->allowScrollLock && screen->scroll_lock) {
+    if (screen->allowScrollLock && screen->scroll_lock && !screen->whichBuf) {
 	refreshheight = 0;
 	screen->scroll_amt = 0;
 	screen->refresh_amt = 0;