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
IRunnableWithProgress op = new IRunnableWithProgress() {
			public void run(IProgressMonitor monitor) {
				CreateFileOperation op = new CreateFileOperation(newFileHandle,
						linkTargetPath, initialContents,
						IDEWorkbenchMessages.WizardNewFileCreationPage_title);
				try {
					PlatformUI.getWorkbench().getOperationSupport()
							.getOperationHistory().execute(
									op,
									monitor,
									WorkspaceUndoUtil
											.getUIInfoAdapter(getShell()));
				} catch (final ExecutionException e) {
					getContainer().getShell().getDisplay().syncExec(
							new Runnable() {
								public void run() {
									if (e.getCause() instanceof CoreException) {
										ErrorDialog
												.openError(
														getContainer()
																.getShell(), 
														
														IDEWorkbenchMessages.WizardNewFileCreationPage_errorTitle,
														null, 
														
														((CoreException) e
																.getCause())
																.getStatus());
									} else {
										IDEWorkbenchPlugin