Add new elements to the top of the list based on sort order, e.g. newest first

[phildenhoff]

E.g. if I start with this layout, at timestamp $n$:

- Articles:
  - 1
  - 2
  - 3

When I sync at timestamp $n+1$, adding newer articles, my layout must look like this:

- Articles:
  - x
  - y
  - 1
  - 2
  - 3