[birt-dev] Checkin: bugzilla 175894 - SwingLiveChartViewer example is br

["Yulin Wang" <yulin.wang@xxxxxxxxxxx>]

- Summary:
SwingLiveChartViewer example is broken

- Bugzilla Bug (s) Resolved:
175894

- Description:
Check into both 2.1.3 branch and HEAD
1. Update the dataset in chart model before painting to reflect the live effect in sample viewer
2. Add a listener to close TimerTask when viewer is closed
3. Fix a wrong location in Line chart renderer. DataPointHints shouldn’t be changed in specific renderer, otherwise it may produce the offset in the next rendering without re-computation.

- Tests Description :
Visual tests

- Notes to Build Team:

- Notes to Developers:

- Notes to QA:

- Notes to Documentation:

- Files Edited:

"/org.eclipse.birt.chart.examples/src/org/eclipse/birt/chart/examples/api/viewer/SwingLiveChartViewer.java"
"/org.eclipse.birt.chart.engine.extension/src/org/eclipse/birt/chart/render/Line.java"

- Files Added:

- Files Deleted