Cursor skipping additional character after contentEditable="false"

[Dinu]

Assumption:

• arrows, backspace and del should work around contenteditable spans
  
• no wrong refactoring should be due to CK
  

Test:
1) Set contents to

ABCD<span contenteditable="false">EFGH</span>IJKL

Problems:
Firefox: arrows move caret one character off, effectively skipping one extra character; backspace doesn't work on span, del works but removes one extra character

2) Set contents to

ABCD<span contenteditable="false">EF<span contenteditable="true">12</span>GH</span>IJKL

Problems:
Webkit: Placing caret after F or H and hit backspace, or before E or G and press Del, strange refactoring occurs.
IE: cursor can't enter or leave inner span using arrows; probably browser related
Firefox: ditto

(Unrelated yet related): API demo seems broken in Opera, can't set editor contents. Will try later.

I'm not sure if I needed to create separate tickets, seems that since the test case is this specific functionality (have keyboard operations work on contenteditable areas), should all go in one place.

[Krzysztof Studnik]

Confirmed. Second test case, under IE and Firefox are related to first, where cursor skips one character. Because it is a bug which also occurs in previous versions of CKEditor, I changed Summary of this ticket.

[Dinu]

The webkit refactoring doesn't seem connected to the cursor skipping peculiarities...

[Piotrek Koszuliński]

Thanks to #9764 most of these issues (if not all) were fixed in CKEditor. Although, there's no support for nested inline editables (#10974).