Bug 146750 [DataBinding][CompositeTable] Crash when dragging scroll bar
Run CompositeTableTest Drag scroll bar down Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: -1, Size: 6 at java.util.LinkedList.entry(LinkedList.java:360) at java.util.LinkedList.get(LinkedList.java:303) at org.eclipse.jface.examples.databinding.compositetable.InternalCompositeTable.currentRow(InternalCompositeTable.java:1671) at org.eclipse.jface.examples.databinding.compositetable.InternalCompositeTable.fireRowDepartEvent(InternalCompositeTable.java:1511) at org.eclipse.jface.examples.databinding.compositetable.InternalCompositeTable.setTopRow(InternalCompositeTable.java:732) at org.eclipse.jface.examples.databinding.compositetable.InternalCompositeTable$2.widgetSelected(InternalCompositeTable.java:1239) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:90) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1074) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3158) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2838) at org.eclipse.jface.examples.databinding.compositetable.test.CompositeTableTest.main(CompositeTableTest.java:167)
examples/org.eclipse.jface.examples.databinding/src/org/eclipse/jface/examples/databinding/compositetable/InternalCompositeTable.java
* <li>Makes sure the correct number of rows are visible
	 * <li>Makes sure each row has been refreshed with data from the underlying
	 * model
	 * </ul>
	 */
	void updateVisibleRows() {
		
		if (rowControl == null) {
			return;
		}
		
		clientAreaHeight = controlHolder.getSize().y;
		if (clientAreaHeight <= 0) {
			return;
		}
		int topPosition = 0;
		int headerHeight = 0;
		if (myHeader != null) {
			headerHeight = headerControl.getSize().y + 3;
			clientAreaHeight -= headerHeight;
			topPosition += headerHeight;
		}
		numRowsInDisplay = clientAreaHeight / getRowHeight(clientAreaHeight);
		
		int userScrollDirection = 0;
		if (numRowsInCollection > 0) {
			numRowsVisible = numRowsInDisplay;
			disposeEmptyTablePlaceholder();
			int displayableRows = numRowsInCollection - topRow;
			if (numRowsVisible > displayableRows) {