Nyall Dawson 5216220872 Fix more racy conditions
Switch from QtConcurrent::run to QThreadPool::start

QtConcurrent doesn't give us anyway to cancel queued but not
started tasks. QThreadPool does (and also allows us to specify
task priority)
2016-12-05 14:08:11 +10:00
..
2016-12-05 14:08:11 +10:00
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