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
oldSelection = getSelection();
			inChange = restoreSelection = true;
			
			updateCode.run();
		} finally {
			inChange = false;
			
			if (restoreSelection) {
				setSelectionToWidget(oldSelection, reveal);
			}
			
			ISelection newSelection = getSelection();
			if (!newSelection.equals(oldSelection)) {
				handleInvalidSelection(oldSelection, newSelection);
			}
		}
	}
	
	/*
	 * Non-Javadoc. Method declared on Viewer.
	 */
	public void refresh() {
		refresh(getRoot());
	}
	/**
	 * Refreshes this viewer with information freshly obtained from this
	 * viewer's model. If <code>updateLabels</code> is <code>true</code>
	 * then labels for otherwise unaffected elements are updated as well.
	 * Otherwise, it assumes labels for existing elements are unchanged, and