The built-in Diff viewer has no way to navigate quickly to the previous or next change (or hunk). This would be very helpful, especially if also implementing #615.

I suggest adding icon-toggles (up-down arrows) for "Prev(ious)/Next Change" (with corresponding hotkeys) in the top (mini-)bar of the built-in Diff viewer.

For reference, SmartGit and GitKraken has this feature, and it's also very common in standalone diff/merge vievers like P4Merge, Meld etc.