https://bugs.openjdk.java.net/browse/JDK-8173028 http://cr.openjdk.java.net/~prr/8173028/
An off by-one bug in assigning remaining glyphs in the cluster to char indices so that the zero advance gets assigned to latin "a" and it is not a hit anymore.
font/layout/swing text regression tests have been run. -phil.
