Additional related ideas / avenues for experimentation:

* Consider whether to keep the longer suggestion as an item in the dropdown or simply remove it (replacing it with the shorter suggestion that just goes to the end of the word).

* Consider whether we could do the same for search queries from the server.  I.e., only inline to the end of the current word.  The question in the first bullet point can apply here as well.

* Consider whether we should do this for queries that are not the top-scoring query.  For example, if I have the search query "on the media wrong number" in my history and type "on the m", even if "on the media wrong number" is not going to be inlined, we could consider offering the suggestion "on the media" in the dropdown (i.e., complete to the end of the word), perhaps instead of or in addition to the full query, and again perhaps on server-sourced suggestions or just history-sourced suggestions.

Reminder, this change affects a somewhat narrow slice of traffic (inputs for which we inline autoocomplete to something past the end of the current word).  Thus, we should use "counterfactual" logging to allow analysis on just the slice of traffic for which the user could've seen a change.  (Use set_field_trial_triggered() as appropriate.)

I still think something here is worth doing.  But none of us are planning to work on it next quarter, so it's clearly implicitly a P3.

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