Styles system creates two identical subsequent inline elements

[Piotrek Koszuliński]

Reproduced on Safari, Chrome and Firefox. I haven't checked IE.

1. Clear contents.
2. Type abcd.
3. Bold "c".
4. Set the caret before "c" in a way that the style won't be active (on FF you must move caret further left and then go back right using arrow keys).
5. Press the bold button and type "x".

Result: <p>ab<strong>x</strong><strong>c</strong>d</p>

[Jakub Ś]

Problem can be reproduced in every browser from CKEditor 3.0.