Bug 24521 [Viewers] TreeViewer.update() does not work correctly with filter
When I add an element which does not satisfy the filtering condition and then update it so that it does, call to update does not show the element. This is because[StructuredViewer.update]: public void update(Object element, String[] properties) { Assert.isNotNull(element); | Widget item = findItem(element); | if (item == null) | return; the code silently ignores that the element may become visible... btw. later in code of this method: if (needsRefilter) { refresh(); return; } This is quite inefficient, as it needs to query all visible items; however only one element may actually change (change visibility and/or sort order).
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/StructuredViewer.java
* initially.
	 * @since 3.1
	 */
	private ColorAndFontCollector colorAndFontCollector = new ColorAndFontCollector();
	
	/**
	 * 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
		 */