[IE7-10] Undo gives JS error after 2+ switches to source mode.

[Joel]

Reproducible in IE9 in ​http://ckeditor.com/demo and nightly 13-03-13-08-51

1. Do any undoable change, like add HR
2. Go to source mode and switch back
3. Go to source mode and switch back again
4. Click undo icon or press Ctrl-Z

The error comes in IE developer tools console. For me the error was

SCRIPT70: Ei käyttöoikeutta 
ckeditor.js?mjldea, rivi 58 merkki 486

IE9, Win 7 64bit. Not reproducible in Chrome or Firefox.

[Jakub Ś]

Problem can be reproduced all versions of IE from CKEditor 4.0.1.

JS Error:
Message: Access Denied
Line: 190
URI: ckeditor4/core/dom/document.js

[Jakub Ś]

Another TC from IBM:

1. Open any CK Editor sample, enter some text
2. Switch to Source view and back to rich text again.
3. Keep cursor in editor body, type some more text, Now click Undo icon or Ctrl + Z

#10216 was marked as duplicate.

[Piotrek Koszuliński]

I pushed ​t/10212 on dev with simple patch that seems to fix this issue. I'm not putting this ticket on review, since test should be wrriten.

[Piotrek Koszuliński]

I pushed a test on t/10212. I couldn't reproduce this issue from code on IE9, but test correctly fails on IE8 and IE7.

[Olek Nowodziński]

Replying to Reinmar:

I pushed a test on t/10212. I couldn't reproduce this issue from code on IE9, but test correctly fails on IE8 and IE7.

There's one browser that is affected by this issue but passes TC without the patch, namely IE10. This is a minor issue though, so R+.

[Piotrek Koszuliński]

Fixed on master with ​git:2c54f8d on dev and 2a8e535 on tests.