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
internalRefresh(element, updateLabels);
			}
		});
	}
	/**
	 * 
	 * Refreshes the given item with the given element. Calls
	 * <code>doUpdateItem(..., false)</code>.
	 * <p>
	 * This method is internal to the framework; subclassers should not call
	 * this method.
	 * </p>
	 * @param widget
     *            the widget
	 * @param element
     *            the element
	 */
	protected final void refreshItem(Widget widget, Object element) {
		SafeRunnable.run(new UpdateItemSafeRunnable(widget, element, true));
	}
	/**
	 * Removes the given open listener from this viewer. Has no affect if an
	 * identical listener is not registered.
	 * 
	 * @param listener
	 *            an open listener
	 */
	public void removeOpenListener(IOpenListener listener) {
		openListeners.remove(listener);
	}