Github user yu74n commented on the issue:
https://github.com/apache/zeppelin/pull/2695
Whether a user can find the notebook in trash or not is based on permission
of the notebook, then If user 'B' has properly permission for the notebook
deleted by user 'A', user 'B' can find the notebook in trash.
However, I find some issues in this PR. For example, user 'A' delete a
notebook, then user 'B' restore the notebook from trash. In this PR, even if
user 'B' has 'owner' permission for the notebook, cannot do that.
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