Index: openacs-4/packages/xowiki/tcl/includelet-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/includelet-procs.tcl,v
diff -u -r1.234 -r1.235
--- openacs-4/packages/xowiki/tcl/includelet-procs.tcl	21 Nov 2018 09:56:37 -0000	1.234
+++ openacs-4/packages/xowiki/tcl/includelet-procs.tcl	21 Nov 2018 12:32:18 -0000	1.235
@@ -4665,9 +4665,6 @@
           {-chat_id ""}
           {-mode ""}
           {-path ""}
-          -login_messages_p
-          -logout_messages_p
-          -timewindow
         }}
       }
   chat instproc render {} {
@@ -4676,21 +4673,10 @@
       # make the chat just for including page
       set chat_id [${:__including_page} item_id]
     }
-    set chat_cmd [list \
-                      ::xowiki::Chat login \
-                      -chat_id $chat_id \
-                      -mode $mode \
-                      -path $path]
-    # We don't want to override Chat class default with our own and
-    # therefore we build the command dynamically depending if these
-    # variables are there or not.
-    set optional_vars [list login_messages_p logout_messages_p timewindow]
-    foreach var $optional_vars {
-      if {[info exists $var]} {
-        lappend chat_cmd -${var} [set $var]
-      }
-    }
-    set r [{*}$chat_cmd]
+    set r [::xowiki::Chat login \
+               -chat_id $chat_id \
+               -mode $mode \
+               -path $path]
 
     #ns_log notice chat=>$r