comparison repoint @ 2167:f74a4ec13912

Sample a column only if it is set (avoids flash of mis-ranged material when scrolling with view normalisation on)
author Chris Cannam
date Wed, 19 Dec 2018 10:40:49 +0000
parents 1b6ffed298a2
children
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2166:24c1e00af9e4 2167:f74a4ec13912