How to synchronize waveform and spectrogram

[srdecny]

I've noticed that the spectrogram is ever so slightly shifted compared to the waveform. Is there any way to make them perfectly in sync? I understand that the waveform is computed using a sliding window algorithm, so there's some natural lookahead/lookbehind. Not sure if this isn't a bug, actually. The screenshots are using the examples/audio/ahoy.mp4 file, which is quite short, so it shouldn't be related to #2737.

[katspaugh]

Looks like a bug indeed!