- '%><(<N>)', '%><|(<N>)': similar to '% <(<N>)', '%<|(<N>)'
respectively, but padding both sides (i.e. the text is centered)
- %(trailers): display the trailers of the body as interpreted by
- linkgit:git-interpret-trailers[1]
+ linkgit:git-interpret-trailers[1]. If the `:only` option is given,
+ omit non-trailer lines from the trailer block. If the `:unfold`
+ option is given, behave as if interpret-trailer's `--unfold` option
+ was given. E.g., `%(trailers:only:unfold)` to do both.
NOTE: Some placeholders may depend on other options given to the
revision traversal engine. For example, the `%g*` reflog options will