issue: Duplicate Page Requests

This addresses an issue where clicking Open, Post Reply, etc. more than once
whilst creating/responding to a ticket will generate duplicate requests.
This causes duplicate responses to be sent out or duplicate tickets being
created. This adds jQuery, on both Agent and User side, to disable the
submit buttons when the "Loading" popup appears so you cannot click the
button more than once.

js/osticket.js

@@ -45,6 +45,9 @@ $(document).ready(function(){
 
     $('form').submit(function() {
         $(window).unbind('beforeunload');
+        // Disable client-side Post Reply/Create Ticket buttons to help
+        // prevent duplicate POST
+        $(':submit', $(this)).attr('disabled', true);
         $('#overlay, #loading').show();
         return true;
        });

scp/js/scp.js

@@ -163,6 +163,9 @@ var scp_prep = function() {
 
     $('form.save, form:has(table.list)').submit(function() {
         $(window).unbind('beforeunload');
+        // Disable staff-side Post Reply/Open buttons to help prevent
+        // duplicate POST
+        $(':submit', $(this)).attr('disabled', true);
         $('#overlay, #loading').show();
         return true;
      });