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
* provider, a default label provider, no sorter, and no filters.
	 */
	protected StructuredViewer() {
		
	}
	/**
	 * Adds a listener for double-clicks in this viewer. Has no effect if an
	 * identical listener is already registered.
	 * 
	 * @param listener
	 *            a double-click listener
	 */
	public void addDoubleClickListener(IDoubleClickListener listener) {
		doubleClickListeners.add(listener);
	}
	/**
	 * Adds a listener for selection-open in this viewer. Has no effect if an
	 * identical listener is already registered.
	 * 
	 * @param listener
	 *            an open listener
	 */
	public void addOpenListener(IOpenListener listener) {
		openListeners.add(listener);
	}
	/*
	 * (non-Javadoc) Method declared on IPostSelectionProvider.
	 */
	public void addPostSelectionChangedListener(ISelectionChangedListener listener) {
		postSelectionChangedListeners.add(listener);