Allow source to indicate that refreshing is needed

[blueyed]

Currently when changing g:deoplete#sources#jedi#python_path deoplete-jedi would use a new environment when gather_candidates is called, but this might not happen when previous completions are being used.

Is it feasible to provide some API to make this possible?

It could also be a Vimscript function, that could then be wrapped by a command/function like DeopleteJediSetEnvironment.

[Shougo]

Why it is needed?
I don't understand.
deoplete-jedi should check the variable.

[Shougo]

If it is need, deoplete-jedi should use deoplete#send_event().

[blueyed]

deoplete-jedi is not called (its gather_candidates).
It is a corner case until completions are refreshed (i.e. deoplete-jedi's gather_candidates is called again).

I do not know about the internals (prev completions) that much, it might be mainly due to bugs (e.g. #800) that it takes longer than expected.

If it is need, deoplete-jedi should use deoplete#send_event().

Ok, good reference.