[news.eclipse.platform] Check if a user operation is blocked by backgrou

[demeester_roel@xxxxxxxxxxxxx (Roel De Meester)]

Currently our project [eclipse-ccase] has the nasty feature that it 
continues to run a background [refresh status] job when the user decides 
to exit eclipse.
A "Progress Information" dialog is shown stating that "The user operation 
is waiting for background work to complete".

I would like to clear my jobqueue when the users quits the application.

My question?

How can i figure out that the user has decided to quit the application? 
We have tried the following but to no avail
* Job.isBlocking() returns false
* systemBundle.getState() == Bundle.STOPPING   returns false

Any other things i could check?

Greetings
Roel De Meester