Bug 330553 [Import/Export] Importing a project that exists in workspace location merges the contents
(1) Create a project in the default location (2) Export it to an archive (3) Delete it (but don't choose the option to delete from disk) (4) Make some changes in the <workspace root>/<project> directory (4) Import the archive you exported in step 2 This results in files from both the archive and directory. If the directory already has a file thats available in the archive, then it doesn't modify it. Ideally we shouldn't be allowing the import at all.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/WizardProjectsImportPage.java
* 
			 * @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 getProjectRecords();
			}
			/*
			 * (non-Javadoc)
			 * 
			 * @see
			 * org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java
			 * .lang.Object)
			 */
			public boolean hasChildren(Object element) {
				return false;
			}
			/*
			 * (non-Javadoc)