Trigger code completion in Stride or Java. Start typing until there is one unique item available. A little enter-key symbol appears to the right of the item to indicate that if you pressed enter right now, that item would be selected. Then delete the content until there are multiple options, and go up and down. The enter prompt will still be shown next to the old item.
In actual fact, enter will always complete the item currently selected. So I think perhaps either we should always show the prompt on the selected row, or we should just dump it?