Refactoring `merge-dict-assign` does not trigger when the value being set is a function parameter

Checklist

[x] I have searched the Sourcery documentation for the issue, and found nothing
[x] I have checked there are no open bugs referencing the same bug or problem

Description

Code snippet that reproduces issue

1 - Case reported in https://github.com/sourcery-ai/sourcery/issues/339

Input:

def __init__(self, toUserName, fromUserName, mediaId):
    self.__dict = {}
    self.__dict['ToUserName'] = toUserName
    self.__dict['FromUserName'] = fromUserName
    self.__dict["CreateTime"] = int(time.time())
    self.__dict["MediaId"] = mediaId

Expected refactored code:

def __init__(self, toUserName, fromUserName, mediaId):
    self.__dict = {
        'ToUserName': toUserName,
        'FromUserName': fromUserName,
        "CreateTime": int(time.time()),
        "MediaId": mediaId
    }

Actual refactored code:

def __init__(self, toUserName, fromUserName, mediaId):
    self.__dict = {
        'ToUserName': toUserName,
        'FromUserName': fromUserName,
        "CreateTime": int(time.time()),
    }
    self.__dict["MediaId"] = mediaId

2 - Simplified version

The bug can more easily be reproduced with the following snippets: Input:

def foo(mediaId):
    d = {}
    d["CreateTime"] = int(time.time())
    d["MediaId"] = mediaId

Expected refactored code:

def foo(mediaId):
    d = {"CreateTime": int(time.time()), "MediaId": mediaId}

Actual refactored code:

def foo(mediaId):
    d = {"CreateTime": int(time.time())}
    d["MediaId"] = mediaId

Debug Information

Sourcery Version: 1.2.0

sourcery-ai / sourcery

Refactoring `merge-dict-assign` does not trigger when the value being set is a function parameter #342