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
}
		return resourceGroup.getResource();
	}
	
	/**
	 * Returns the file extension to use when creating the new file.
	 * 
	 * @return the file extension or <code>null</code>.
	 * @see WizardNewFileCreationPage#setFileExtension(String)
	 * @since 3.3 
	 */
	public String getFileExtension() {
		if (resourceGroup == null) {
			return initialFileExtension;
		}
		return resourceGroup.getResourceExtension();		
	}
	/**
	 * Returns a stream containing the initial contents to be given to new file
	 * resource instances. <b>Subclasses</b> may wish to override. This default
	 * implementation provides no initial contents.
	 * 
	 * @return initial contents to be given to new file resource instances
	 */
	protected InputStream getInitialContents() {
		return null;
	}
	/**
	 * Returns the label to display in the file name specification visual
	 * component group.