make HISTORY_SUBSTRING_SEARCH_ENSURE_UNIQUE force search unique result #162
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Because HIST_IGNORE_ALL_DUPS cant actually remove all dups with APPEND_HISTORY, INC_APPEND_HISTORY and SHARED_HISTORY options, it is better to have this options actually "ensure" if history got only unique elements. It is better do that with any state of HIST_IGNORE_ALL_DUPS zsh setting