Delete source branch when commits reach default branch

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Problem to solve

When creating or editing a merge request that references an unprotected source branch, there's the merge option to "Delete source branch when merge request is accepted".

In scenarios where a feature branch is first merged with staging followed by staging being merged with master (see below), enabling this setting could potentially delete a feature branch before it's merged with master. For users that make use of a staging branch for manual verification and acceptance, this behavior is unacceptable.

First: 
    [feature branch] --MR to--> [staging (protected)]  -->(merge)   --> (final manual verification & acceptance)
Then later:
    [staging (protected)] --MR to--> [master (protected)]  -->(merge) 

Proposal

A new merge option to "Delete source branch when commits reach default branch". Alternatively, the user could select a target branch that the commits must reach in order for the source branch to be deleted.