[MlMt] Feature Request: View Folder / Source In Mail Header

[Michael Nietzold]

what i do:

- i search over all my messages
- i see a result list, but the source column is set to small width

what i expect:

- i see an additional line in the header part of the current mail with 
the folder / source

   where:

     - in Mail Preview in 3Pane View
     - in Mail Single View
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