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Further fixes to the scrollable cache logicspectrogram-minor-refactor 2016-01-29, by Chris Cannam
Start refactoring out the spectrogram image cachespectrogram-minor-refactor 2016-01-29, by Chris Cannam
Fix calculation of repaint area when we haven't scrolled but cache is not completespectrogram-minor-refactor 2016-01-27, by Chris Cannam
Start repainting from the middle -- but this is quite unreliablespectrogram-minor-refactor 2016-01-26, by Chris Cannam

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