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
if (needsRefilter) {
					break;
				}
			}
		}
		if (needsRefilter) {
			preservingSelection(new Runnable() {
				public void run() {
					internalRefresh(getRoot());
					refreshOccurred = true;
				}
			});
			return;
		}
		boolean needsUpdate;
		if (properties == null) {
			needsUpdate = true;
		} else {
			needsUpdate = false;
			IBaseLabelProvider labelProvider = getLabelProvider();
			for (int i = 0; i < properties.length; ++i) {
				needsUpdate = labelProvider.isLabelProperty(element, properties[i]);
				if (needsUpdate) {
					break;
				}
			}
		}
		if (needsUpdate) {
			updateItem(widget, element);
		}