Begin sampling with the demo device, sample rate set to 1Hz. Now roll the mouse down to zoom out. Assertion fails: /pv/logicdatasnapshot.cpp:290: void pv::LogicDataSnapshot::get_subsampled_edges( std::vector<std::pair<long int, bool> >&, uint64_t, uint64_t, float, int): Assertion `_mip_map[level].data' failed.