IE9 shift+enter causes cursor to jump

[Jack Bowman]

Happens in IE9.

Repro:

• go to ​http://ckeditor.com/demo
• select and remove all of the text
• type "A" [shift-enter] "-123" [shift-enter] "B" [shift-enter] "C"
• position the cursor between the "-" and the "1"
• type [shift-enter]

Result: A -1 23 B C

Expected Result: A - 123 B C

[Jack Bowman]

Sorry, I didn't format the result properly.

Result:
A
-1
23
B
C

Expected Result:
A
-
123
B
C

[Jakub Ś]

Sample code:

A<br />
-123<br />
B<br />
C

Reproducible in IE9 from CKEditor 3.5.1 rev. [6337]