[clug] long run function in trolltech qt widget

[Ian]

> (And, yes, threads often /seem/ to work, until you discover that your
>  software randomly crashes on some subset of machines in production, in
>  ways that are effectively impossible to debug.  Not the path to
>  reliable software, and also often lower performance as a bonus.)

Or you get the firefox effect as the contention on the file descriptor
table (shared memory) continues to increase while the subset of users
that use lots of tabs gets more and more frustrated with your
software.

-Ian

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