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GoToFlow::setNumSlides() is called each time a comic is opened. So when e.g. three comics were opened one after another without restarting YACReader, each of the PictureFlow::centerIndexChanged* signals was connected to GoToFlow::preload three times, which multiplied the number of calls to preload() accordingly. During my testing PictureFlow::centerIndexChanged* signals were never emitted before the first call to GoToFlow::setNumSlides(), so connecting in GoToFlow::GoToFlow() should not cause extra calls to preload().