R1:75b8d3312bbb

Hide the autocompleter intelligently when you ignore it and keep typing

Summary:
Ref T10163. When we think the user has finished typing a word (because they typed a space, period, or other similar characters) and nothing else they might type could possibly change the outcome (usually because the words they have typed already match nothing), just deactivate the autocomplete.

As a special case, if the word they have typed already select exactly one result, //and// they have already typed exactly that…