Jaen's fortress start hidden and re-hide after you kill Jaen

rsrc/scenarios/stealth/towns/town20.spec

@@ -270,7 +270,7 @@
 	pic 0, 4
 	ex1 -1, -1, -1
 	ex2 -1, -1, -1
-	goto -1
+	goto 43
 @disp-msg = 39
 	sdf -1, -1
 	msg 59, 60, -1
@@ -299,3 +299,10 @@
 	ex1 1, 34, -1
 	ex2 -1, -1, -1
 	goto -1
+@town-visible = 43
+	sdf -1, -1
+	msg -1, -1, -1
+	pic 0, 4
+	ex1 20, -1, -1
+	ex2 0, -1, -1
+	goto -1

rsrc/scenarios/stealth/towns/town20.xml

@@ -12,7 +12,9 @@
     <onenter condition="dead">41</onenter>
     <onexit dir="e">37</onexit>
     <timer freq="50">42</timer>
-    <flags />
+    <flags>
+        <hidden>true</hidden>
+    </flags>
     <wandering>
         <monster>13</monster>
         <monster>13</monster>