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/WizardNewFileCreationPage.java
.log(
														getClass(),
														"createNewFile()", e.getCause()); 
										MessageDialog
												.openError(
														getContainer()
																.getShell(),
														IDEWorkbenchMessages.WizardNewFileCreationPage_internalErrorTitle,
														NLS
																.bind(
																		IDEWorkbenchMessages.WizardNewFileCreationPage_internalErrorMessage,
																		e
																				.getCause()
																				.getMessage()));
									}
								}
							});
				}
			}
		};
		try {
			getContainer().run(true, true, op);
		} catch (InterruptedException e) {
			return null;
		} catch (InvocationTargetException e) {
			
			
			IDEWorkbenchPlugin.log(getClass(),
					"createNewFile()", e.getTargetException()); 
			MessageDialog