These days there are often 2 posts published close to each other, like a release announcement and a Month In WordPress post. When that happens, the earlier post is often pushed out of the widget before many people have had a chance to see it.
Ideally, the number of total items would remain at `4`, to reduce visual clutter. Implementing a conditional item would require a significant refactor, though. Increasing the total number of items to `5` is a practical compromise.
Props hlashbrooke, tellyworth.
Fixes#43441.
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