[FF] Redo not working after viewing source

[Damian]

To reproduce:

1. Open nightly build
   
2. Type a few sentences
   
3. Undo half the entered text
   
4. Go to source and back to rich text
   
5. Try to redo

Result: the redo command does not redo the whole list of changes

Expected result: the redo command should redo all changes that were initially undone in step 3.

Reproduced on FF 3.5.5

Works in IE 7.

[Frederico Caldeira Knabben]

The fact is that, by going to source, you're creating a new undo step, which clears the redo stack.