Bug 122869 Drag a parameter from data explorer view into a table in library, a new parameter is created automatically.
Description:Drag a parameter from data explorer view into a table in library, a new parameter is created automatically. Steps to reproduce: 1. Add a cascading parameter and a table in a library file. 2. Drag a parameter from data explorer view into a table cell in layout editor. 3. Find that a new parameter was added in data explorer view automatically.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dialogs/ExpressionTreeSupport.java
}
	/**
	 * Insert a text string into the text area
	 * 
	 * @param text
	 */
	protected void insertText( String text )
	{
		StyledText textWidget = expressionViewer.getTextWidget( );
		if ( !textWidget.isEnabled( ) )
		{
			return;
		}
		int selectionStart = textWidget.getSelection( ).x;
		if ( text.equalsIgnoreCase( "x++" ) ) 
		{
			text = textWidget.getSelectionText( ) + "++";
		}
		else if ( text.equalsIgnoreCase( "x--" ) )
		{
			text = textWidget.getSelectionText( ) + "--";
		}
		else if ( text.equalsIgnoreCase( "++x" ) )
		{
			text = "++" + textWidget.getSelectionText( );
		}
		else if ( text.equalsIgnoreCase( "--x" ) )
		{
			text = "--" + textWidget.getSelectionText( );
		}