Bug 255172 [Import/Export] Warning message in the import wizard is not so helpful
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/WizardProjectsImportPage.java
public Object[] getElements(Object inputElement) {
				return getValidProjects();
			}
			/*
			 * (non-Javadoc)
			 * 
			 * @see
			 * org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java
			 * .lang.Object)
			 */
			public boolean hasChildren(Object element) {
				return false;
			}
			/*
			 * (non-Javadoc)
			 * 
			 * @see
			 * org.eclipse.jface.viewers.ITreeContentProvider#getParent(java
			 * .lang.Object)
			 */
			public Object getParent(Object element) {
				return null;
			}
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.jface.viewers.IContentProvider#dispose()
			 */
			public void dispose() {
			}