Bug 153387 Database item can't be dragged and dropped onto editor field
Steps to reproduce: 1.Start up BIRT in Mac OS X; 2.File->New->Project; 3.File->New->Report Design; 4.In Data Explorer, create a New Data Source, and choose "Classic Models Inc. Sample DataBase", press "Next" and then press "finish"; 5.In Data Explorer, create a New Data Set, press "Next"; 6.In the popup window, expand the "CLASSICMODELS", select and drag a item onto the editor field at right side.
data/org.eclipse.birt.report.data.oda.jdbc.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/editors/SQLDataSetEditorPage.java
addDropSupportToViewer();
        
        viewer.getTextWidget( ).addKeyListener( new KeyListener( ) {
			public void keyPressed( KeyEvent e )
			{
				if ( isUndoKeyPress( e ) )
				{
					viewer.doOperation( ITextOperationTarget.UNDO );
				}
				else if ( isRedoKeyPress( e ) )
				{
					viewer.doOperation( ITextOperationTarget.REDO );
				}
			}
			private boolean isUndoKeyPress( KeyEvent e )
			{
				
				return ( ( e.stateMask & SWT.CONTROL ) > 0 )
						&& ( ( e.keyCode == 'z' ) || ( e.keyCode == 'Z' ) );
			}
			private boolean isRedoKeyPress( KeyEvent e )
			{
				
				return ( ( e.stateMask & SWT.CONTROL ) > 0 )
						&& ( ( e.keyCode == 'y' ) || ( e.keyCode == 'Y' ) );
			}
			public void keyReleased( KeyEvent e )
			{
				
			}