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
for (Iterator i = filters.iterator(); i.hasNext();) {
				Object o = i.next();
				if (o == filter) {
					i.remove();
					refresh();
					if (filters.size() == 0) {
						filters = null;
					}
					return;
				}
			}
		}
	}
	/**
	 * Sets the filters, replacing any previous filters, and triggers
	 * refiltering and resorting of the elements.
	 * 
	 * @param filters
	 *            an array of viewer filters
	 * @since 3.3
	 */
	public void setFilters(ViewerFilter[] filters) {
		if (filters.length == 0) {
			resetFilters();
		} else {
			this.filters = new ArrayList(Arrays.asList(filters));
			refresh();
		}
	}