Return Key in IE10 inserts multiple line-breaks

[Max]

Steps to reproduce

1. Open ​http://sdk.ckeditor.com/samples/inline.html in IE 10
2. Click on "Start Editing"
3. Press Return Key on the keyboard (one line-break is inserted)
4. Click on "Finish Editing"
5. Click on "Start Editing"
6. Press Return Key on the keyboard (two line-breaks are inserted)

Repeating steps 4-6 will insert one more line-break per repeat step.

Expected result

Return Key should always only insert one line-break.

Actual result

see above.

Other details (browser, OS, CKEditor version, installed plugins)

Browser is Internet Explorer 10 on Windows 7.

[Jakub Ś]

This is in fact a duplicate of #10093.