hg: openjfx/8/controls/rt: fix RT-25187 charts - duplicate children added when sorting the chart data.

[hang.vo at oracle.com]

Changeset: e67a5c63ca31
Author:    Paru Somashekar <paru.somashekar at oracle.com>
Date:      2012-12-14 15:08 -0800
URL:       http://hg.openjdk.java.net/openjfx/8/controls/rt/rev/e67a5c63ca31

fix RT-25187 charts - duplicate children added when sorting the chart data.
+ unit test.

! javafx-ui-charts/src/javafx/scene/chart/XYChart.java
! javafx-ui-charts/test/javafx/scene/chart/XYChartDataTest.java