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
}
	/**
	 * Adds support for dragging items out of this viewer via a user
	 * drag-and-drop operation.
	 * 
	 * @param operations
	 *            a bitwise OR of the supported drag and drop operation types (
	 *            <code>DROP_COPY</code>,<code>DROP_LINK</code>, and
	 *            <code>DROP_MOVE</code>)
	 * @param transferTypes
	 *            the transfer types that are supported by the drag operation
	 * @param listener
	 *            the callback that will be invoked to set the drag data and to
	 *            cleanup after the drag and drop operation finishes
	 * @see org.eclipse.swt.dnd.DND
	 */
	public void addDragSupport(int operations, Transfer[] transferTypes, DragSourceListener listener) {
		Control myControl = getControl();
		final DragSource dragSource = new DragSource(myControl, operations);
		dragSource.setTransfer(transferTypes);
		dragSource.addDragListener(listener);
	}
	/**
	 * Adds support for dropping items into this viewer via a user drag-and-drop
	 * operation.
	 * 
	 * @param operations
	 *            a bitwise OR of the supported drag and drop operation types (
	 *            <code>DROP_COPY</code>,<code>DROP_LINK</code>, and
	 *            <code>DROP_MOVE</code>)