Bug 219901 [Undo] new file creation subjec to Undo (file deleted without warning)
when creating a new file by right clicking on your project in the project explorer new->file this action is put on the undo/redo stack. Pressing Ctrl-Z to undo this action will thus delete your file. As this stack is separate from the stack in the editor , one can create a new file, work for a long time, then inadvertently press ctrl-z to undo a code change while having the focus on the project explorer and irrevocably lose their file. Redo will create a new EMPTY file; the work is gone, forever. This appears to only work for the "new file", not for "new->source file" etc. Although some may perceive this as a feature, it is hard to imagine a scenario where ctrl-z should permanently delete a file without warning.
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/dialogs/WizardNewFolderMainPage.java
composite.setFont(parent.getFont());
		composite.setLayout(new GridLayout());
		composite.setLayoutData(new GridData(GridData.VERTICAL_ALIGN_FILL
				| GridData.HORIZONTAL_ALIGN_FILL));
		PlatformUI.getWorkbench().getHelpSystem().setHelp(composite,
				IIDEHelpContextIds.NEW_FOLDER_WIZARD_PAGE);
		resourceGroup = new ResourceAndContainerGroup(composite, this,
				IDEWorkbenchMessages.WizardNewFolderMainPage_folderName,
				IDEWorkbenchMessages.WizardNewFolderMainPage_folderLabel,
				false, SIZING_CONTAINER_GROUP_HEIGHT);
		resourceGroup.setAllowExistingResources(false);
		createAdvancedControls(composite);
		initializePage();
		validatePage();
		
		setErrorMessage(null);
		setMessage(null);
		setControl(composite);
	}
	/**
	 * Creates a folder resource given the folder handle.
	 * 
	 * @param folderHandle
	 *            the folder handle to create a folder resource for
	 * @param monitor
	 *            the progress monitor to show visual progress with
	 * @exception CoreException
	 *                if the operation fails
	 * @exception OperationCanceledException
	 *                if the operation is canceled