Bug 305703 [Viewers][CommonNavigator] remembered contributions can leak when using filters
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/StructuredViewer.java
/** 
	 * Calls when associate() and disassociate() are called
	 */
	private StructuredViewerInternals.AssociateListener associateListener;
	
	/**
	 * Empty array of widgets.
	 */
	private static Widget[] NO_WIDGETS = new Widget[0];
	/**
	 * The ColorAndFontCollector is a helper class for viewers
	 * that have color and font support ad optionally decorators.
	 * @see IColorDecorator
	 * @see IFontDecorator
	 * @see IColorProvider
	 * @see IFontProvider
	 * @see IDecoration
	 */
	protected class ColorAndFontCollectorWithProviders extends ColorAndFontCollector{
		IColorProvider colorProvider;
		IFontProvider fontProvider;
		
		/**
		 * Create a new instance of the receiver using the supplied
		 * label provider. If it is an IColorProvider or IFontProvider
		 * set these values up.
		 * @param provider IBaseLabelProvider
		 * @see IColorProvider
		 * @see IFontProvider
		 */