[IE] JS errors logged when pressing delete in specific case

[Piotrek Koszuliński]

1. Open replacebyclass sample.
2. Focus editor and place cursor at the beginning of first header.
3. Press delete few times.
4. If you've been lucky IE logged from one to tens of JS errors.

I can reproduce this issue on IE8, but I haven't checked other IEs. Sometimes I have to repeat this TC few times.

Error:

  Invalid argument.  node.js, line 295 character 3

Sometimes different one is logged:

  Invalid argument.  selection.js, line 928 character 10

I've been able to reproduce this issue from 4.0, but I think that it is older, because I stopped being able to reproduce it when we changed our sample content layout (image was moved from left to right).

[Jakub Ś]

I was able to reproduce this problem in IE8 only from CKEditor 4.0.

I have tried to use similar content in 4.0 beta (image aliment to right) but no error occurred.

[Jakub Ś]

This is in fact DUP of #10584

@Reinmar I'm closing your issue as duplicate of #10584 as the former explains better what is going on.