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
if (it.hasNext()) {
			Object next = it.next();
			IResource selectedResource = null;
			if (next instanceof IResource) {
				selectedResource = (IResource) next;
			} else if (next instanceof IAdaptable) {
				selectedResource = (IResource) ((IAdaptable) next)
						.getAdapter(IResource.class);
			}
			if (selectedResource != null) {
				if (selectedResource.getType() == IResource.FILE) {
					selectedResource = selectedResource.getParent();
				}
				if (selectedResource.isAccessible()) {
					resourceGroup.setContainerFullPath(selectedResource
							.getFullPath());
				}
			}
		}
		setPageComplete(false);
	}
	/*
	 * @see DialogPage.setVisible(boolean)
	 */
	public void setVisible(boolean visible) {
		super.setVisible(visible);
		if (visible) {
			resourceGroup.setFocus();
		}
	}