Github user mebelousov commented on the issue:
https://github.com/apache/zeppelin/pull/3163
@zjffdu
* Now usual note has tooltip "Move this note to trash" on trash button.
Trashed note has tooltip "Remove this note permanently".
* Trashed note must be deleted on "Trash" button click.
* I know that noteId is unique. But what if somebody create "zpln" file in
"notebook" folder and duplicate ID?---
