The main window contains multiple views: the ancestry graph, the file list of the currently selected commit, etc.
At present it appears the keyboard focus is always exclusively attached to the ancestry graph, even if I mouse-click on a file name in the commit list.
I'd like to be able to navigate within a given commit by using the <arrow up=""> and <arrow down=""> keys on the file list, to review the given changeset in detail.
When I now click on a filename in the listing in the lower right window, then hint <arrow up=""> or <arrow down="">, qgit will move to a different commit, instead of changing the selected file (and changing the appropriately displayed patch portion in the lower-left window), which is quite confusing, and arguably wrong.
Sorry, it appears the formatting came out wrong in my original message. I was referring to the arrow keys ('up' and 'down'), which don't have the expected effect.