Added test: `testChartLineAndAreaRemovedOnClearingSeries()` for `StackedAreaChart` to check if the line and fill elements gets removed from the series on clearing the series. This test is added similar to the tests added to `LineChart` and `AreaChart`. This test is not required for `BarChart`, `BubbleChart` and `ScatterChart` as no node will added to the series in these charts.
------------- Commit messages: - Add test to check if line and area removed on clearing series Changes: https://git.openjdk.org/jfx/pull/1231/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1231&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8314779 Stats: 20 lines in 1 file changed: 20 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jfx/pull/1231.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1231/head:pull/1231 PR: https://git.openjdk.org/jfx/pull/1231
