hg: jdk/sandbox: 8190835: Subtraction with two javax.xml.datatype.Duration gives incorrect result

[chris.hegarty at oracle.com]

Changeset: 4fa199e67e41
Author:    joehw
Date:      2018-06-29 10:13 -0700
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/4fa199e67e41

8190835: Subtraction with two javax.xml.datatype.Duration gives incorrect result
Reviewed-by: lancea

! src/java.xml/share/classes/com/sun/org/apache/xerces/internal/jaxp/datatype/DurationImpl.java
! test/jaxp/javax/xml/jaxp/unittest/datatype/DurationTest.java