Serialize access to the progress bar
The only way https://bugs.kde.org/show_bug.cgi?id=331616&list_id=939077 can happen is if two actions try to initialize, and therefore delete, the progress bar at the same time. So, serialize with a mutex and at the same time wrap the progress bar in a QPointer so we can be sure to be able to figure out whether it has been deleted. BUG:331616
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10409079
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