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
* 
	 * @see #setSelection(ISelection, boolean)
	 */
	private boolean restoreSelection;
	/**
	 * List of double-click state listeners (element type:
	 * <code>IDoubleClickListener</code>).
	 * 
	 * @see #fireDoubleClick
	 */
	private ListenerList doubleClickListeners = new ListenerList();
	/**
	 * List of open listeners (element type:
	 * <code>ISelectionActivateListener</code>).
	 * 
	 * @see #fireOpen
	 */
	private ListenerList openListeners = new ListenerList();
	/**
	 * List of post selection listeners (element type:
	 * <code>ISelectionActivateListener</code>).
	 * 
	 * @see #firePostSelectionChanged
	 */
	private ListenerList postSelectionChangedListeners = new ListenerList();
	/**
	 * The colorAndFontCollector is an object used by viewers that
	 * support the IColorProvider, the IFontProvider and/or the 
	 * IViewerLabelProvider for color and font updates.
	 * Initialize it to have no color or font providing