Combine IPython and jedi completion logic

We are trying to implement traits autocompletion in traitlets, (see this PR). We achieve this by overwriting the __init__ method __signature__. It works just fine when jedi is not enabled. The thing is that does not work with jedi (see this issue).

Until it is fixed in jedi, I guess we could fix it in IPython by taking into account both the completion from jedi and the completion computed in IPython (it looks like IPython autocompletion logic takes the __signature__ into account?).

[Carreau]

There is a longstanding plan to try to get all the IPython features into Jedi –  I’d love to have funding to push Jedi forward. So yes this would be great. I’m also trying to get funding to get @LucianaMarques for this winter outreachy, I believe she is interesting in doing some work on the completer.

[martinRenou]

Sure! I would be happy to collaborate and contribute a bit to the IPython completion logic, I feel like it deserves a bit more love at some places 😃

I wanted to try and fix this other issue, if you want to take a look at it. It seems like people are interested in having only path completion when typing in a string, and that this part of the code is supposed to achieve this but does not work.

I’d love to have funding to push Jedi forward

It would be awesome.