Multiple Initialize - Destroy actions cause issues in IE

[smholstein]

When the inline CKeditor is initialized dynamically on the same element multiple times IE runs the enter key multiple times (the number of times the editor has been initialized). I have not seen the problem in Firefox or Chrome. Only IE. I am running IE10 on Windows 8. The only key I have found to be affected is Enter. Attaching a test file for reproduction.

To reporduce:

1. Click Init and see that enter works as expected adding 1 p element after pressed.
2. Click Destroy and Init again. Enter key will add 2 p elements after pressed.
3. Click Destroy and Init again. Enter Key will add 3 p elements after pressed.

So on...

[Jakub Ś]

Problem can be reproduced in IE9-10 from CKEditor 4.0 beta.

In test1.html I have removed all jQuery code just to make sure it doesn't cause any problems. You get as many enters as times editor was initialied

[Jakub Ś]

DUP of #10093.