The suggestions waited for Photon beside the index for up to its full
2.5 s deadline on every keystroke, and their misses and spent allowance
paused Photon for the search and the reverse lookup as well.
Once the index has answered, Photon now gets 300 ms more and is then
called off; with nothing from the index it is still waited for. The
keystroke question has a shorter deadline and its own tally of misses and
pauses, a question called off by the list counts as no miss, and a pause
of the search still holds the suggestions back.
Refs #2877
Maurice
28a577df5e