SimpleChat:JS: bottom of element visible, Set focus to user input

As the generated text could be multiple lines and occupy more space
that the full scrollable div's vertical space, make the bottom of
the last element (which can be such a generated text) in the div
visible by scrolling.

Ensure that the user input box has focus

examples/server/public_simplechat/simplechat.js

@@ -54,7 +54,7 @@ class SimpleChat {
             last = entry;
         }
         if (last !== undefined) {
-            last.scrollIntoView(true);
+            last.scrollIntoView(false);
         }
     }
 
@@ -178,6 +178,7 @@ async function handle_submit(inputSystem, inputUser, divChat, apiEP) {
     if ((apiEP == ApiEP.Completion) && (gbCompletionFreshChatAlways)) {
         gChat.xchat.length = 0;
     }
+    inputUser.focus();
 
 }