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/src/org/eclipse/ui/wizards/newresource/BasicNewProjectResourceWizard.java
.newProjectDescription(newProjectHandle.getName());
		description.setLocationURI(location);
		
		if (referencePage != null) {
			IProject[] refProjects = referencePage.getReferencedProjects();
			if (refProjects.length > 0) {
				description.setReferencedProjects(refProjects);
			}
		}
		
		IRunnableWithProgress op = new IRunnableWithProgress() {
			public void run(IProgressMonitor monitor)
					throws InvocationTargetException {
				CreateProjectOperation op = new CreateProjectOperation(
						description, ResourceMessages.NewProject_windowTitle);
				try {
					PlatformUI.getWorkbench().getOperationSupport()
							.getOperationHistory().execute(
									op,
									monitor,
									WorkspaceUndoUtil
											.getUIInfoAdapter(getShell()));
				} catch (ExecutionException e) {
					throw new InvocationTargetException(e);
				}
			}
		};
		
		try {
			getContainer().run(true, true, op);