Two minor improvements to the completion:

1. auto-completion for parameters is done without needing to pass the beggining of a parameter. To give an example:

class Test:
    def __init__(self, aaa, aab, aac):
        pass

with the PR: this allows to do: Test( then TAB directly to select the arguments

upstream/main: you need to do Test(a before completion kicks in. Test( gives nothing

2. auto-completion results are ordered slightly differently: parameters should be prioritized when available.

this PR:

upstream/main: