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Begin fixing the various snap operations. Also remove SnapNearest, which is never used and seems to consume more lines of code than the rest!single-point 2019-03-20, by Chris Cannam
Use overspill to render time-value point line properly at edgessingle-point 2019-03-20, by Chris Cannam
Update TimeValueLayer etcsingle-point 2019-03-19, by Chris Cannam

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