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Improve "no completions" popup
The message says "Database needs refreshing" and should say "This list may be incomplete". The latter is more contextual, since the list is right there.
We should also make it more obvious by using the tooltip background colour and maybe putting it at the top of the list instead of the bottom.
We should also display the popup when there are no completions, so that the user knows that we've acknowledged their typing. This also means that the "list may be incomplete" will be displayed even when there are no completions.