This reverts commit 74135c0600d5dcc40d396d0e7293c17b8d4bdaa7, reversing
changes made to 6d749789ce240a3e6f1447777db63fd8e7525560.
See discussion in #1317
Renamed autosuggest_handle_special to autosuggest_special_validate_from_history
Began work to factor autosuggest_special_validate_from_history together with autosuggest_suggest_special