* Add autoimport support for deoplete
* Fix test_deoplete_source.py
* Use callback instead of is_async for deoplete
Shuogo, the author of Deoplete, does not recommend using the `is_async`
option:
> I think is_async is not recommended. It is not so useful and broken.
> You should use callback system instead.
Link: https://github.com/Shougo/deoplete.nvim/issues/1006#issuecomment-526797857
Incidentally, the same thread mentiones an issue started by w0rp:
https://github.com/Shougo/deoplete.nvim/issues/976
The deoplete docs also say is_async is deprecated:
> is_async (Bool)
> If the gather is asynchronous, the source must set
> it to "True". A typical strategy for an asynchronous
> gather_candidates method to use this flag is to
> set is_async flag to True while results are being
> produced in the background (optionally, returning them
> as they become ready). Once background processing
> has completed, is_async flag should be set to False
> indicating that this is the last portion of the
> candidates.
>
> Note: The feature is deprecated and not recommended.
> You should use callback system by
> |deoplete#auto_complete()| instead.
Link: https://github.com/Shougo/deoplete.nvim/blob/master/doc/deoplete.txt
Co-authored-by: w0rp <w0rp@users.noreply.github.com>
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