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we recalc twice on idle, one for invalid and one for old frecencies. need marco's last_visit_date change to make old work right, or do a subquery until then. right now, we are going to recalc the same places over and over. (if we do a sub query, watch out for performance)
recalculating for invalid (frecency == -1) is for firefox 2 / 3b2 -> b3
recalculating for old frecencies is for the ebay problem (https://bugzilla.mozilla.org/show_bug.cgi?id=394038#c19)
to solve the ebay problem, we should also recalc the moz_places with high frecency and "old" last visit date. (In another patch, marco has added last visit date to moz_places, which will make the query we need more efficient as we don't have to join against moz_historyvisits)
If something has a recent last visit date, then we recently recalculated
frecency, so the frecency would be accurate.
If something has a low frecency and an old last visit date, recalculating would only lower the frecency (and low frecency wouldn't be hurting our autocomplete results.)
But if something has a high frecency and an old last visit date, recalculating the frecency would lower the frecency, which would solve the ebay problem.
7)
prefs->SetIntPref(PREF_BROWSER_LEFTPANEFOLDERID, -1);"
x)
