Bug 191662 [Import/Export] Warn of duplicate projects in project import wizard
Build ID: I20070601-1539 Steps To Reproduce: 1. Create a project. 2. Export it to *.zip file. 3. Close the project. 4. Try to import it. 5. Empty projects list. More information: This is pretty annoying, since I am using mylar and a workspace with many closed projects. If I try to import a project that already exists, I see nothing and I am pretty confused (there is no warning).
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/WizardProjectsImportPage.java
projectsList = new CheckboxTreeViewer(listComposite, SWT.BORDER);
		GridData listData = new GridData(GridData.GRAB_HORIZONTAL
				| GridData.GRAB_VERTICAL | GridData.FILL_BOTH);
		projectsList.getControl().setLayoutData(listData);
		projectsList.setContentProvider(new ITreeContentProvider() {
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object)
			 */
			public Object[] getChildren(Object parentElement) {
				return null;
			}
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
			 */
			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;
			}
			/*