List indent fix structure

[Martin]

Let`s assume we have direction from left to right

1. Open empty editor
   
2. Create UL\OL list with some text in LI items
   
3. Select all
   
4. Click 'Decrease indent'
   
5. UL\OL will be consume by editor and there left only LI items text
   

You can reproduce this bug in reverse order mean in direction from right to left

My purpose to resolve this issue is disable decrease\increase indent button\action when this action have no sense

Bug is reproductive in enviroments and CKEditor versions:

(Safari) -> 3.0

(FF 3.6) -> 3.4.1

(IE 8) -> 3.0

(Opera 10.62) -> 3.0

[Sa'ar Zac Elias]

This is by design. "Decrease indent" should remove the list, while "Increase indent" should create an inner list.