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Bug in get leaf neighbors of ghost elements #2438

Description

@lenaploetzke

Bug report

Describe the bug
The leaf neighbors for ghost elements does not work as expected.
I came along this error because i used the neighbors of ghosts for testing purpose in a mesh handle test.
To make sure that the error is not in the mesh handle, i wrote a small test without mesh handle functionality.
I think the error is that some neighbors are returned twice.

To Reproduce
I wrote a very short test on the branch bug-in-neighbor-of-ghost.
To reproduce, please execute with 5 processes.
(Please ignore the other failing tests with 5 processes, there is either an other issue for this, error is related to this bug or i am working on it.)

Estimated priority

"Priority: medium" Should be solved within half a year

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priority:highShould be solved as soon as possibleworkload:mediumWould take a week or less

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