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Completion at point with empty prefix?

From: Dmitry Gutov
Subject: Completion at point with empty prefix?
Date: Fri, 30 Nov 2012 04:15:15 +0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (windows-nt)

In the mode I'm writing, in certain contexts, there can be only a
limited set of completions when the function call has no sender.

So I don't actually need a prefix to show the user the set of methods
they can call at the point, and supporting that should increase the API

How do I set that up? I have a completion-at-point function working, but
if START is the same as END in the returned list, `completion-at-point'
just says "No symbol here".

I tried inserting space after point and returning END = START + 1, made
no difference.


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