Bug 122365 In data set dialog, add parameter first then edit query, parameter value will be cleared out.
Description: In data set dialog, add parameter first then edit query, parameter value will be cleared out. Steps to reproduce: 1. Add a data set. 2. In data set dialog, add a parameter. 3. Edit query and use this parameter. 4. Preview in data set dialog, it works. 5. Change to "parameter" page, its value is cleared out.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dialogs/PropertyHandleTableViewer.java
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 * Contributors:
 *  Actuate Corporation  - initial API and implementation