* fix for #3547
see https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty
because of "strict mode" - the `parentNode` property may not be writable and causes an error in `fakedom.js` (appendChild)
to reproduce: install CodeMirror, install "Tools for exploring internals of TW", open a heavy Tiddler like the Control-Panel in edit-mode, toggle preview on, switch to "parse tree" or "widget tree"
* check for tw fakedom
b629b1412d