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
final Object[] selected = projectsList.getCheckedElements();
		createdProjects = new ArrayList();
		WorkspaceModifyOperation op = new WorkspaceModifyOperation() {
			protected void execute(IProgressMonitor monitor)
					throws InvocationTargetException, InterruptedException {
				try {
					monitor.beginTask("", selected.length); 
					if (monitor.isCanceled()) {
						throw new OperationCanceledException();
					}
					for (int i = 0; i < selected.length; i++) {
						createExistingProject((ProjectRecord) selected[i],
								new SubProgressMonitor(monitor, 1));
					}
				} finally {
					monitor.done();
				}
			}
		};
		
		try {
			getContainer().run(true, true, op);
		} catch (InterruptedException e) {
			return false;
		} catch (InvocationTargetException e) {
			
			Throwable t = e.getTargetException();
			String message = DataTransferMessages.WizardExternalProjectImportPage_errorMessage;
			IStatus status;