Show Blocks + setData causes blocks refresh problem

[Damian]

When setData is called on the editor while show blocks is enabled, the block indicators are not refreshed properly.

Attached example test.

To reproduce:

1. Open attached sample
   
2. When editor ready, press Set Data.
   
3. Enable Show Blocks
   
4. Change the text in the edit area and press Set Data again
   

Results:
Show Blocks is still active on toolbar but block indicators are no longer rendered properly.

[Tobiasz Cudnik]

Patch handles also new page command.

[Frederico Caldeira Knabben]

It looks like we don't need the on('mode') code anymore at this point.

Also, please preserve the code style. It's just a matter of maintaining the style we can see in the statements a few lines above the patch changes.

[Tobiasz Cudnik]

Fixed with [3699].