[IE11] Unable to close CKEditor dialogs

[frietsch]

As the release of IE11 is getting closer (scheduled for shipping with Windows 8.1 in August - seems that Microsoft is in a hurry...), I thought that it's a good idea to test-drive CKE.

Unfortunately, my test drive didn't get far, as I can't close any CKEditor dialog that I open (e.g. link, picture). The F12 tools report a lot of "access denied" errors.

I can see the problem both on the 4.x demo page and in v3.6.6, which is still our production version (and has more IE11 problems, but I can understand that nobody will fix them for that old version).

Haven't found the time to debug in deep until now, but that might be related with "IE hacks" no longer applying.

Microsoft has changed the user agent to get rid of old hacks: ​http://www.nczonline.net/blog/2013/07/02/internet-explorer-11-dont-call-me-ie/

Testing IE11 is rather easy. The official ISO images of Windows 8.1 can be downloaded from: ​http://windows.microsoft.com/en-us/windows-8/preview-iso The product key is also mentioned on that page. Afterwards, it can be installed in VirtualBox, which requires a small patch, depending on its version: ​https://blogs.oracle.com/fatbloke/entry/using_virtualbox_to_test_drive