Bug 11770 java browsing: multi-selection disabled in 2 of 4 views
multi selection is disabled in the package and type views but it's enabled in project and member views
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/browsing/TypesView.java
/**
	 * Creates and returns the label provider for this part.
	 * 
	 * @return	the label provider
	 * @see	ILabelProvider
	 */
	protected ILabelProvider createLabelProvider() {
		return new StandardJavaUILabelProvider(
						StandardJavaUILabelProvider.DEFAULT_TEXTFLAGS,
						StandardJavaUILabelProvider.DEFAULT_IMAGEFLAGS,
						StandardJavaUILabelProvider.getAdornmentProviders(true, null)
						);
	}
	/**
	 * Adds filters the viewer of this part.
	 */
	protected void addFilters() {
		getViewer().addFilter(new NonJavaElementFilter());
	}
	/**
	 * Answers if the given <code>element</code> is a valid
	 * input for this part.
	 * 
	 * @param 	element	the object to test
	 * @return	<true> if the given element is a valid input
	 */
	protected boolean isValidInput(Object element) {
		return element instanceof IPackageFragment;