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A further refactor with range blockszoom 2018-09-21, by Chris Cannam
Refactor out paintChannelzoom 2018-09-21, by Chris Cannam
Fix typo that created un-reloadable session filezoom 2018-09-21, by Chris Cannam
Ensure getFrameForX returns value on zoom blocksize boundary; take advantage of that (this is essentially reverting to the same behaviour as in the default branch, which we should probably have done all along)zoom 2018-09-21, by Chris Cannam

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