* Track only files in folders by glob pattern ("migrations" is default value)
* Do not even open dot folders (.venv, .idea etc) to improve performance

broken due to the recent update of KeywordArgumentCompletionUtil:
891c4bf4.

Namely, for classes with __init__ containing **kwarg, it's properly
passed to PyKeywordArgumentProviders. It broke down because reference in
a constructor call is resolved into both class and its constructor, but
only the type of the corresponding class is inferred. Also,
parameters of the actual function is used, not those supplied by
a type provider because the latter usually omit "self", and then
presense of **kwargs can be overlooked due to the way
KwArgParameterCollector handles them.

ClassMemberProvider should not access ancestors, it should be done by getMembers client.

Most notably, after stub indices are initialized

Individual stub indices are stored in content of StubUpdatingIndex

* remove method from PushSupport and its implementations;
* remove related UI components;
* simplify code;

`-u` parameter moved to the front to let `-m <module name>` stay together.

enums can't be extended but can appear in type parameters bound thus inheritance check is feasible

otherwise with generateFinalLocals=true, non-final variables could be made final which leads to red code

in find occurrences previews

after-review API cleanup