git-show does not display commit header

How to reproduce:

• open a project in a git repository
• Tools/Git/Current file/Log
• click on a commit id

Actual Result:

• The diff is displayed in a side-by-side view.
• There is no commit header (author, date, commit message, ...)

Expected Result:

• Either the old view (commit header, unified diff)
• or the commit header above the split view / as first lines in the split view.