SCM - go to next/previous change (Alt-F5) should cycle between files

In #18059, @Tyriar requested that this work like "go to next problem" (F8), but the way it's been implemented there's a crucial difference - upon reaching the end of the file, it goes back to the top, rather than the next changed file! This means, for example, that when reviewing changes prior to staging, I end up running git diff in a terminal to avoid a lot of fiddly mouse clicking. Any other power user surely does the same. This is a shame, since VScode has replaced every other one of my everyday uses of git.

I see no reason anyone would be opposed to this change.