Handsontable undo workaround.

Author: n1v0lg

client/index.html

@@ -192,9 +192,8 @@ <h3>Additional Questions</h3>
             };
         submissionHandling(inputSources, '/');
       });
-
     });
   </script>
   </div>
 </body>
-</html>
+</html>

client/script/ssCreate.js

@@ -104,6 +104,12 @@ var makeTable = function (divID, tableConfig) {
           && validateSum(value, colValues);
       }
     },
+    beforeChange: function (changes, source) {
+      // Workaround for handsontable undo issue
+      if (this.readOnly) {
+        return false;
+      }
+    },
     cells: function (row, col, prop) {
       var cellProperties = {},
           isReadOnly = this.instance.getSettings().readOnly;