Comment 4 for bug 780021

Added a workaround to 1.10 that makes WNumberPos use the above fix. Changing the Track duration itself is not good because that will get saved to the database. Arguably the track is corrupt or we have a SoundSource bug if the metadata for the track says something that is different from iTrackNumSamples / (2*iTrackSampleRate) but I'd prefer not to permanently change peoples databases until we can figure out the reason.