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bug#11906: 24.1; completion-at-point failures

From: Stefan Monnier
Subject: bug#11906: 24.1; completion-at-point failures
Date: Fri, 10 May 2013 23:40:39 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux)

>> The difference between 2 and 3 calls shouldn't be sufficiently large to
>> go from "acceptable" to "terrible delay".
> It is a difference between 1 and 3 calls because a user can also run
> octave in terminal and find that how responsive it actually is.

But the generic completion code can't easily go down to a single call in
the general case.

> I think if completion-at-point can work well when there is a 2-second
> cost in a completion-at-point function, it can provide an excellent
> experience.

Obviously it can, via caching.  Most completion tables which incur
a significant computation code should use caching, but we can't use
caching unconditionally, because it's hard to come up with a general
conditions under which the cache can be reused or needs to be flushed.

As mentioned, we could try and provide a generic completion-table cache
so as to make it easier to write completion tables that have
a significant computation cost.  Patches welcome.


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