Author Coloring setting
Created originally on Bitbucket by Roger Kratz
The description of this setting says
Color changesets by author name. If not enabled, the changes are colored green for merge, red for non-trivial parents, black for normal. Default: False
If enabled, the changesets will be colored by author name as stated. However, if set to false/default, all changeset will be black - no matter if they are merge changesets or not.
If the coloring is wrong or the description is wrong, I don't know.