FCK fake objects are not copy-and-paste proof

[PavelZ]

In both IE and FF:
Steps to reproduce
1. insert pagebreak
2. select part of text containing the pagebreak and copy it to the clipboard
3. place cursor anywhere and paste from clipboar
4. now there are two pagebreaks in the text
5. press "Source" button twice
6. only one pagebreak survived


In IE we are also able to get JavaScript error by following steps:
1. insert pagebreak
2. copy it to the clipboard
3. press "Source" button twice
3. paste the pagebreak from clipboard
4. press "Source"
JS error "Permission denied" occures

[w.olchawa]

Confirmed using FCKeditor 2.6.3 and the latest SVN version. I was unable to reproduce the second part of the ticket (JavaScript error).