Merge Spam-Notifications

[GoogleCodeExporter]

What steps will reproduce the problem?
1. "Misconfigure" Growl to show all tracemessages
2. Send a LOT of notifications in seconds
3. they should be displayed very slowly


What is the expected output?
Well - growl does what it should do - it displays them one by one. But my PC 
was not responding to anything (except mouse-moving) for minutes. I had to kill 
the growl-process.  

What do you see instead?
I like the feature of the "away"-notifications (summary). Would it be able to 
use the same display-function in the case of a spamming application? Maybe with 
an option like "Display more than X notifications as summary..."?

What version of the product are you using? On what operating system?
Growl 2.0.4.1, WinXP SP3

Please provide any additional information below.

Original issue reported on code.google.com by [email protected] on 18 Aug 2010 at 6:05