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
/**
	 * Determines whether a change to the given property of the given element
	 * would require refiltering and/or resorting.
	 * <p>
	 * This method is internal to the framework; subclassers should not call
	 * this method.
	 * </p>
	 * 
	 * @param element
	 *            the element
	 * @param property
	 *            the property
	 * @return <code>true</code> if refiltering is required, and
	 *         <code>false</code> otherwise
	 */
	protected boolean needsRefilter(Object element, String property) {
		if (sorter != null && sorter.isSorterProperty(element, property)) {
			return true;
		}
		if (filters != null) {
			for (int i = 0, n = filters.size(); i < n; ++i) {
				ViewerFilter filter = (ViewerFilter) filters.get(i);
				if (filter.isFilterProperty(element, property)) {
					return true;
				}
			}
		}
		return false;
	}
	/**