Bug 162655 [Undo] [IDE] - Undoing a delete should check for existence of resources to be restored
N20061027. - I deleted two projects (along with their content). I read the warning that undo delete cannot restore the content and said "OK." - Then I checked out those same projects from HEAD. - Then I selected "Undo Delete Resources." This overwrote my code with empty projects. I think that "Undo Delete Resources" should become invalid if the resources exist again, because you'll end up replacing content without keeping a backup.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/ide/undo/DeleteResourcesOperation.java
* http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 ******************************************************************************/
package org.eclipse.ui.ide.undo;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.mapping.IResourceChangeDescriptionFactory;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.jobs.ISchedulingRule;
import org.eclipse.ui.internal.ide.undo.UndoMessages;
/**
 * A DeleteResourcesOperation represents an undoable operation for deleting one
 * or more resources in the workspace. Clients may call the public API from a
 * background thread.
 * 
 * This class is intended to be instantiated and used by clients. It is not
 * intended to be subclassed by clients.
 * 
 * <strong>EXPERIMENTAL</strong> This class or interface has been added as part
 * of a work in progress. This API may change at any given time. Please do not
 * use this API without consulting with the Platform/UI team.
 * 
 * @since 3.3
 * 
 */
public class DeleteResourcesOperation extends AbstractResourcesOperation {