message: only unsee things that were seen
diff: @@ -10,7 +10,9 @@ export function refreshCode(branch) {
  function load(source) {
  /* eslint no-unused-vars: 0 */
  function define(moduleName) {
  + if (window.requirejs.entries[moduleName]) {
  window.requirejs.unsee(moduleName);
  + }
  window.define.apply(this, arguments);
  }
  eval(source);
  