Bug 151205 [Viewers] Add setFilters() to change multiple filters at once efficiently
When one needs to add more than one filter after every request a refresh command is issued which is not desired an API-Function where the user could control whether the refresh is called or not would be a great performance improvement.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/StructuredViewer.java
/**
	 * 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>)
	 * @param transferTypes
	 *            the transfer types that are supported by the drop operation
	 * @param listener
	 *            the callback that will be invoked after the drag and drop
	 *            operation finishes
	 * @see org.eclipse.swt.dnd.DND
	 */
	public void addDropSupport(int operations, Transfer[] transferTypes,
			final DropTargetListener listener) {
		Control control = getControl();
		DropTarget dropTarget = new DropTarget(control, operations);
		dropTarget.setTransfer(transferTypes);
		dropTarget.addDropListener(listener);
	}
	/**
	 * Adds the given filter to this viewer, and triggers refiltering and
	 * resorting of the elements.
	 * 
	 * @param filter
	 *            a viewer filter
	 */
	public void addFilter(ViewerFilter filter) {