Notification bubble can change size while Confirmation bubble is visible

[Abhishek Mukherjee]

It is currently possible to change size of appendable notification bubbles while a confirmation bubble is visible. This goes against the spec which says:

"The first bubble, if it is a notification bubble, should also never change size while any confirmation bubble is also visible; instead, it should wait until all current confirmation bubbles have disappeared."

Steps to reproduce:
I could not get append to work with notify-send so I have the attached chunk of python code which should help debug this issue.
1) python notification_change_size_bug.py
2) change volume before 1 second timer runs out
3) note text grows behind volume

[Abhishek Mukherjee (linkinpark342)]

This is fixed in trunk by the sliding behavior. I'm not sure if this is the right way to close the bug in launchpad but seems the most sensible at the time...