A live YouTube search was always dropped on reload so it could never
re-spend quota. But the default scrape source costs no quota, so there's
no reason to bounce the user back to the feed — they can stay on their
results.
Feed now stamps history.state._ytScrape=true once a search resolves via
the scrape source; App restores _yt on reload only when that flag is set
(and re-runs the search, which is free). An api-source search is left
unmarked and still drops to the feed on reload, since re-fetching it would
cost ~100 units. The flag is cleared when a new search starts (Feed
re-stamps it once the new results' source is known).
peter
036491b88b