List features not working

[Damian]

Steps to reproduce:

1. Open a sample
   
2. Create a bullet list and then ensure it is selected
   

3.a Press the bullet list button
or
3.b Press the number list button
or
3.c Press the outdent button

Expected behaviour:
Case (3.a), the newly created list should undone.
Case (3.b), the bullet list should be changed to a number list
Case (3.c), the bullet list should be undone as in (3.a)

Actual behaviour:
In some browser the browser hangs. In other cases the expected results don't work.

[Martin Kou]

This is a dup of #3151, which has just been fixed.