Description of problem:
When writing a CD, the progress dialog has two problems.  Their effect
is more pronounced when writing to a file image since that can be
quite quick:

- Once completed, the progress bar goes back to zero.

- Even though it is complete it still says 'Please wait' in bold.

The result is that you could blink, miss the fact that it has
finished, and sit waiting for it to start for some seconds before
realising that it has already completed.

Version-Release number of selected component (if applicable):
0.6.6-1