Function default_undo_entry_fn 

pub fn default_undo_entry_fn(args: UndoEntryArgs) -> UiNode

Default UNDO_ENTRY_FN_VAR.

Returns a Button! with the UNDO_REDO_BUTTON_STYLE_FN_VAR and the entry displayed in a Text! child. The button notifies UNDO_CMD or REDO_CMD with the entry timestamp, the command is scoped on the undo parent of the caller not of the button.