Thread ping pong #5
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This reverts commit 040664d.
Stopped QThreads don't process events, so cleanup signals get lost. Prevent this from happening by keeping the threads alive and the comic inside the thread (as we already do in the viewer). Cleanup happens by connecting the comic's destroyed() signal to the thread's quit() slot.
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Thread ping pong fix, second attempt. This one shouldn't cause gigantic memleaks like the first, but it does keep the comic objects in a dedicated thread during it's lifetime. The lifetime of the thread is always tied directly to the comic object. This roughly works like this: